Seikonaut 40mm Case — ultradunne Nautilus-stijl Seiko mod-kast
One of the thinnest Nautilus bases out there — integrated lines, six finishes to build from.
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<p>At just 9.95 mm with a solid caseback, the Silver Seikonaut is one of the thinnest Nautilus-style Seiko mod cases available. CNC-machined from 316L stainless steel with brushed and polished finishing, this 40 mm case features an integrated-lug silhouette inspired by the iconic Nautilus shape. The included sapphire crystal comes with your choice of clear or blue AR coating, and the screw-down crown delivers 50 m water resistance. Compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements using 30.8 mm dials — read on for full specs, compatibility details, and build tips.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel</td></tr><tr><td>Finish</td><td>Brushed with polished accents</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. This case does not accept 28.5 mm dials without a spacer ring.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L stainless steel, brushed/polished)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Most Nautilus-style mod cases on the market sit between 12 mm and 14 mm thick, which gives them a bulky wrist presence that strays from the slim profile of the original design. The Seikonaut achieves 9.95 mm by re-engineering the internal tolerances — tighter gasket channels, a thinner crystal seat, and a case mid-section milled to precise clearance above the movement. Every case is dimensionally checked before shipping. The integrated-lug silhouette flows into the bracelet line without the stepped transition found on budget alternatives, and the brush-to-polish finishing matches the language of high-end integrated-bracelet sports watches.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit the Seikonaut case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Seikonaut accepts all standard Seiko NH-family automatic movements: NH35, NH36, NH38, NH70, NH71, and NH72. The crown stem needs to be cut to the correct length during installation. The older 7S26 and 7S36 movements are not recommended due to a different stem height.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is the Seikonaut compared to other Nautilus-style cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback (10.3 mm with exhibition), the Seikonaut is significantly thinner than most Nautilus mod cases on the market, which typically measure 12–14 mm. This slimmer profile sits closer to the wrist and better captures the proportions of the original Nautilus design.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What is the difference between the exhibition and solid caseback?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The solid caseback is 9.95 mm total thickness and gives a cleaner, more traditional look. The exhibition caseback adds a sapphire window that lets you see the movement, bringing the total thickness to 10.3 mm. Both options maintain 50 m water resistance. If you are using a skeleton movement like the NH72, the exhibition caseback lets you view the mechanics from the back as well.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is this case waterproof?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Seikonaut is rated to 50 m water resistance when assembled correctly with all gaskets seated properly. This rating covers hand washing, rain, and light splashes. We recommend having a watchmaker pressure-test the completed build if you plan to submerge it.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — matching silver tone, designed for the Seikonaut case</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — brushed silver hands to match the case finish</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — the most popular automatic movement for Seiko mods, reliable and easy to source</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — pair with the exhibition caseback for a full skeleton build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>At just 9.95 mm with a solid caseback, the Silver Seikonaut is one of the thinnest Nautilus-style Seiko mod cases available. CNC-machined from 316L stainless steel with brushed and polished finishing, this 40 mm case features an integrated-lug silhouette inspired by the iconic Nautilus shape. The included sapphire crystal comes with your choice of clear or blue AR coating, and the screw-down crown delivers 50 m water resistance. Compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements using 30.8 mm dials — read on for full specs, compatibility details, and build tips.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel</td></tr><tr><td>Finish</td><td>Brushed with polished accents</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. This case does not accept 28.5 mm dials without a spacer ring.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L stainless steel, brushed/polished)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Most Nautilus-style mod cases on the market sit between 12 mm and 14 mm thick, which gives them a bulky wrist presence that strays from the slim profile of the original design. The Seikonaut achieves 9.95 mm by re-engineering the internal tolerances — tighter gasket channels, a thinner crystal seat, and a case mid-section milled to precise clearance above the movement. Every case is dimensionally checked before shipping. The integrated-lug silhouette flows into the bracelet line without the stepped transition found on budget alternatives, and the brush-to-polish finishing matches the language of high-end integrated-bracelet sports watches.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit the Seikonaut case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Seikonaut accepts all standard Seiko NH-family automatic movements: NH35, NH36, NH38, NH70, NH71, and NH72. The crown stem needs to be cut to the correct length during installation. The older 7S26 and 7S36 movements are not recommended due to a different stem height.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is the Seikonaut compared to other Nautilus-style cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback (10.3 mm with exhibition), the Seikonaut is significantly thinner than most Nautilus mod cases on the market, which typically measure 12–14 mm. This slimmer profile sits closer to the wrist and better captures the proportions of the original Nautilus design.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What is the difference between the exhibition and solid caseback?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The solid caseback is 9.95 mm total thickness and gives a cleaner, more traditional look. The exhibition caseback adds a sapphire window that lets you see the movement, bringing the total thickness to 10.3 mm. Both options maintain 50 m water resistance. If you are using a skeleton movement like the NH72, the exhibition caseback lets you view the mechanics from the back as well.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is this case waterproof?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Seikonaut is rated to 50 m water resistance when assembled correctly with all gaskets seated properly. This rating covers hand washing, rain, and light splashes. We recommend having a watchmaker pressure-test the completed build if you plan to submerge it.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — matching silver tone, designed for the Seikonaut case</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — brushed silver hands to match the case finish</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — the most popular automatic movement for Seiko mods, reliable and easy to source</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — pair with the exhibition caseback for a full skeleton build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>At just 9.95 mm with a solid caseback, the Silver Seikonaut is one of the thinnest Nautilus-style Seiko mod cases available. CNC-machined from 316L stainless steel with brushed and polished finishing, this 40 mm case features an integrated-lug silhouette inspired by the iconic Nautilus shape. The included sapphire crystal comes with your choice of clear or blue AR coating, and the screw-down crown delivers 50 m water resistance. Compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements using 30.8 mm dials — read on for full specs, compatibility details, and build tips.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel</td></tr><tr><td>Finish</td><td>Brushed with polished accents</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. This case does not accept 28.5 mm dials without a spacer ring.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L stainless steel, brushed/polished)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Most Nautilus-style mod cases on the market sit between 12 mm and 14 mm thick, which gives them a bulky wrist presence that strays from the slim profile of the original design. The Seikonaut achieves 9.95 mm by re-engineering the internal tolerances — tighter gasket channels, a thinner crystal seat, and a case mid-section milled to precise clearance above the movement. Every case is dimensionally checked before shipping. The integrated-lug silhouette flows into the bracelet line without the stepped transition found on budget alternatives, and the brush-to-polish finishing matches the language of high-end integrated-bracelet sports watches.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit the Seikonaut case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Seikonaut accepts all standard Seiko NH-family automatic movements: NH35, NH36, NH38, NH70, NH71, and NH72. The crown stem needs to be cut to the correct length during installation. The older 7S26 and 7S36 movements are not recommended due to a different stem height.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is the Seikonaut compared to other Nautilus-style cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback (10.3 mm with exhibition), the Seikonaut is significantly thinner than most Nautilus mod cases on the market, which typically measure 12–14 mm. This slimmer profile sits closer to the wrist and better captures the proportions of the original Nautilus design.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What is the difference between the exhibition and solid caseback?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The solid caseback is 9.95 mm total thickness and gives a cleaner, more traditional look. The exhibition caseback adds a sapphire window that lets you see the movement, bringing the total thickness to 10.3 mm. Both options maintain 50 m water resistance. If you are using a skeleton movement like the NH72, the exhibition caseback lets you view the mechanics from the back as well.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is this case waterproof?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Seikonaut is rated to 50 m water resistance when assembled correctly with all gaskets seated properly. This rating covers hand washing, rain, and light splashes. We recommend having a watchmaker pressure-test the completed build if you plan to submerge it.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — matching silver tone, designed for the Seikonaut case</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — brushed silver hands to match the case finish</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — the most popular automatic movement for Seiko mods, reliable and easy to source</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — pair with the exhibition caseback for a full skeleton build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>At just 9.95 mm with a solid caseback, the Silver Seikonaut is one of the thinnest Nautilus-style Seiko mod cases available. CNC-machined from 316L stainless steel with brushed and polished finishing, this 40 mm case features an integrated-lug silhouette inspired by the iconic Nautilus shape. The included sapphire crystal comes with your choice of clear or blue AR coating, and the screw-down crown delivers 50 m water resistance. Compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements using 30.8 mm dials — read on for full specs, compatibility details, and build tips.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel</td></tr><tr><td>Finish</td><td>Brushed with polished accents</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. This case does not accept 28.5 mm dials without a spacer ring.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L stainless steel, brushed/polished)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Most Nautilus-style mod cases on the market sit between 12 mm and 14 mm thick, which gives them a bulky wrist presence that strays from the slim profile of the original design. The Seikonaut achieves 9.95 mm by re-engineering the internal tolerances — tighter gasket channels, a thinner crystal seat, and a case mid-section milled to precise clearance above the movement. Every case is dimensionally checked before shipping. The integrated-lug silhouette flows into the bracelet line without the stepped transition found on budget alternatives, and the brush-to-polish finishing matches the language of high-end integrated-bracelet sports watches.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit the Seikonaut case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Seikonaut accepts all standard Seiko NH-family automatic movements: NH35, NH36, NH38, NH70, NH71, and NH72. The crown stem needs to be cut to the correct length during installation. The older 7S26 and 7S36 movements are not recommended due to a different stem height.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is the Seikonaut compared to other Nautilus-style cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback (10.3 mm with exhibition), the Seikonaut is significantly thinner than most Nautilus mod cases on the market, which typically measure 12–14 mm. This slimmer profile sits closer to the wrist and better captures the proportions of the original Nautilus design.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What is the difference between the exhibition and solid caseback?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The solid caseback is 9.95 mm total thickness and gives a cleaner, more traditional look. The exhibition caseback adds a sapphire window that lets you see the movement, bringing the total thickness to 10.3 mm. Both options maintain 50 m water resistance. If you are using a skeleton movement like the NH72, the exhibition caseback lets you view the mechanics from the back as well.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is this case waterproof?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Seikonaut is rated to 50 m water resistance when assembled correctly with all gaskets seated properly. This rating covers hand washing, rain, and light splashes. We recommend having a watchmaker pressure-test the completed build if you plan to submerge it.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — matching silver tone, designed for the Seikonaut case</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — brushed silver hands to match the case finish</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — the most popular automatic movement for Seiko mods, reliable and easy to source</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — pair with the exhibition caseback for a full skeleton build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Two-Tone Seikonaut combines brushed silver surfaces with gold-toned accents in a dual-finish approach that mirrors the classic two-tone sports watch formula. At 9.95 mm with a solid caseback, this 40 mm case maintains the ultra-thin Nautilus-inspired profile while adding visual depth through the interplay of cool steel and warm gold. The sapphire crystal comes with clear or blue AR coating, and the screw-down crown delivers 50 m water resistance. Compatible with all NH-family movements and 30.8 mm dials, this case gives builders the two-tone aesthetic without needing two separate parts.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel, two-tone silver and gold</td></tr><tr><td>Finish</td><td>Brushed silver with gold-toned polished accents</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gold, champagne, or silver dials complement the two-tone finish naturally. A white dial keeps things classic, while a dark blue or black dial creates a dressier contrast.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. A two-tone bracelet or a leather strap in brown or tan can extend the dual-tone theme to the wrist. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, two-tone silver and gold finish)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Two-tone watches are a defining look in luxury horology — the Patek Philippe Nautilus and Audemars Piguet Royal Oak both have iconic two-tone references. The Seikonaut two-tone translates that concept into a moddable platform: brushed silver on the broad surfaces for everyday subtlety, and gold-toned accents on the polished edges and bezel details to catch the light. The dual-tone approach is applied at the case level, so builders can pair it with matching gold hands for full cohesion or use contrasting silver hands for a more understated interpretation. The 9.95 mm ultra-thin profile keeps the proportions tight, avoiding the top-heavy look that plagues thicker two-tone mod cases.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is the gold part real gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">No. The gold-toned accents are a PVD coating applied over 316L stainless steel. PVD is more durable than traditional gold plating and maintains its color significantly better with daily wear. The look is gold-tone, not solid gold, which keeps the case accessible while delivering the visual two-tone effect.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What hands should I use with a two-tone case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gold or yellow gold hands create the most cohesive look, matching the gold accents on the case. Silver hands work well for a subtler two-tone where the gold accents on the case provide the only warm element. Our <a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> were designed to match this case’s gold tone.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is this compared to other two-tone Nautilus cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm (solid caseback) and 10.3 mm (exhibition), the Two-Tone Seikonaut is 2–4 mm thinner than most Nautilus-style mod cases on the market. Two-tone cases from other brands are often even thicker than their single-tone counterparts. The Seikonaut maintains the same slim profile across all finishes.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — classic silver dial, lets the case’s gold accents stand out</li><li><a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> — match the gold accents on the case for full two-tone cohesion</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable workhorse movement for an everyday two-tone build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges complement the two-tone aesthetic through the exhibition caseback</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Two-Tone Seikonaut combines brushed silver surfaces with gold-toned accents in a dual-finish approach that mirrors the classic two-tone sports watch formula. At 9.95 mm with a solid caseback, this 40 mm case maintains the ultra-thin Nautilus-inspired profile while adding visual depth through the interplay of cool steel and warm gold. The sapphire crystal comes with clear or blue AR coating, and the screw-down crown delivers 50 m water resistance. Compatible with all NH-family movements and 30.8 mm dials, this case gives builders the two-tone aesthetic without needing two separate parts.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel, two-tone silver and gold</td></tr><tr><td>Finish</td><td>Brushed silver with gold-toned polished accents</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gold, champagne, or silver dials complement the two-tone finish naturally. A white dial keeps things classic, while a dark blue or black dial creates a dressier contrast.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. A two-tone bracelet or a leather strap in brown or tan can extend the dual-tone theme to the wrist. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, two-tone silver and gold finish)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Two-tone watches are a defining look in luxury horology — the Patek Philippe Nautilus and Audemars Piguet Royal Oak both have iconic two-tone references. The Seikonaut two-tone translates that concept into a moddable platform: brushed silver on the broad surfaces for everyday subtlety, and gold-toned accents on the polished edges and bezel details to catch the light. The dual-tone approach is applied at the case level, so builders can pair it with matching gold hands for full cohesion or use contrasting silver hands for a more understated interpretation. The 9.95 mm ultra-thin profile keeps the proportions tight, avoiding the top-heavy look that plagues thicker two-tone mod cases.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is the gold part real gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">No. The gold-toned accents are a PVD coating applied over 316L stainless steel. PVD is more durable than traditional gold plating and maintains its color significantly better with daily wear. The look is gold-tone, not solid gold, which keeps the case accessible while delivering the visual two-tone effect.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What hands should I use with a two-tone case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gold or yellow gold hands create the most cohesive look, matching the gold accents on the case. Silver hands work well for a subtler two-tone where the gold accents on the case provide the only warm element. Our <a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> were designed to match this case’s gold tone.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is this compared to other two-tone Nautilus cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm (solid caseback) and 10.3 mm (exhibition), the Two-Tone Seikonaut is 2–4 mm thinner than most Nautilus-style mod cases on the market. Two-tone cases from other brands are often even thicker than their single-tone counterparts. The Seikonaut maintains the same slim profile across all finishes.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — classic silver dial, lets the case’s gold accents stand out</li><li><a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> — match the gold accents on the case for full two-tone cohesion</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable workhorse movement for an everyday two-tone build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges complement the two-tone aesthetic through the exhibition caseback</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Two-Tone Seikonaut combines brushed silver surfaces with gold-toned accents in a dual-finish approach that mirrors the classic two-tone sports watch formula. At 9.95 mm with a solid caseback, this 40 mm case maintains the ultra-thin Nautilus-inspired profile while adding visual depth through the interplay of cool steel and warm gold. The sapphire crystal comes with clear or blue AR coating, and the screw-down crown delivers 50 m water resistance. Compatible with all NH-family movements and 30.8 mm dials, this case gives builders the two-tone aesthetic without needing two separate parts.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel, two-tone silver and gold</td></tr><tr><td>Finish</td><td>Brushed silver with gold-toned polished accents</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gold, champagne, or silver dials complement the two-tone finish naturally. A white dial keeps things classic, while a dark blue or black dial creates a dressier contrast.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. A two-tone bracelet or a leather strap in brown or tan can extend the dual-tone theme to the wrist. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, two-tone silver and gold finish)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Two-tone watches are a defining look in luxury horology — the Patek Philippe Nautilus and Audemars Piguet Royal Oak both have iconic two-tone references. The Seikonaut two-tone translates that concept into a moddable platform: brushed silver on the broad surfaces for everyday subtlety, and gold-toned accents on the polished edges and bezel details to catch the light. The dual-tone approach is applied at the case level, so builders can pair it with matching gold hands for full cohesion or use contrasting silver hands for a more understated interpretation. The 9.95 mm ultra-thin profile keeps the proportions tight, avoiding the top-heavy look that plagues thicker two-tone mod cases.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is the gold part real gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">No. The gold-toned accents are a PVD coating applied over 316L stainless steel. PVD is more durable than traditional gold plating and maintains its color significantly better with daily wear. The look is gold-tone, not solid gold, which keeps the case accessible while delivering the visual two-tone effect.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What hands should I use with a two-tone case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gold or yellow gold hands create the most cohesive look, matching the gold accents on the case. Silver hands work well for a subtler two-tone where the gold accents on the case provide the only warm element. Our <a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> were designed to match this case’s gold tone.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is this compared to other two-tone Nautilus cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm (solid caseback) and 10.3 mm (exhibition), the Two-Tone Seikonaut is 2–4 mm thinner than most Nautilus-style mod cases on the market. Two-tone cases from other brands are often even thicker than their single-tone counterparts. The Seikonaut maintains the same slim profile across all finishes.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — classic silver dial, lets the case’s gold accents stand out</li><li><a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> — match the gold accents on the case for full two-tone cohesion</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable workhorse movement for an everyday two-tone build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges complement the two-tone aesthetic through the exhibition caseback</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Two-Tone Seikonaut combines brushed silver surfaces with gold-toned accents in a dual-finish approach that mirrors the classic two-tone sports watch formula. At 9.95 mm with a solid caseback, this 40 mm case maintains the ultra-thin Nautilus-inspired profile while adding visual depth through the interplay of cool steel and warm gold. The sapphire crystal comes with clear or blue AR coating, and the screw-down crown delivers 50 m water resistance. Compatible with all NH-family movements and 30.8 mm dials, this case gives builders the two-tone aesthetic without needing two separate parts.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel, two-tone silver and gold</td></tr><tr><td>Finish</td><td>Brushed silver with gold-toned polished accents</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gold, champagne, or silver dials complement the two-tone finish naturally. A white dial keeps things classic, while a dark blue or black dial creates a dressier contrast.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. A two-tone bracelet or a leather strap in brown or tan can extend the dual-tone theme to the wrist. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, two-tone silver and gold finish)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Two-tone watches are a defining look in luxury horology — the Patek Philippe Nautilus and Audemars Piguet Royal Oak both have iconic two-tone references. The Seikonaut two-tone translates that concept into a moddable platform: brushed silver on the broad surfaces for everyday subtlety, and gold-toned accents on the polished edges and bezel details to catch the light. The dual-tone approach is applied at the case level, so builders can pair it with matching gold hands for full cohesion or use contrasting silver hands for a more understated interpretation. The 9.95 mm ultra-thin profile keeps the proportions tight, avoiding the top-heavy look that plagues thicker two-tone mod cases.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is the gold part real gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">No. The gold-toned accents are a PVD coating applied over 316L stainless steel. PVD is more durable than traditional gold plating and maintains its color significantly better with daily wear. The look is gold-tone, not solid gold, which keeps the case accessible while delivering the visual two-tone effect.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What hands should I use with a two-tone case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gold or yellow gold hands create the most cohesive look, matching the gold accents on the case. Silver hands work well for a subtler two-tone where the gold accents on the case provide the only warm element. Our <a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> were designed to match this case’s gold tone.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is this compared to other two-tone Nautilus cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm (solid caseback) and 10.3 mm (exhibition), the Two-Tone Seikonaut is 2–4 mm thinner than most Nautilus-style mod cases on the market. Two-tone cases from other brands are often even thicker than their single-tone counterparts. The Seikonaut maintains the same slim profile across all finishes.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — classic silver dial, lets the case’s gold accents stand out</li><li><a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> — match the gold accents on the case for full two-tone cohesion</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable workhorse movement for an everyday two-tone build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges complement the two-tone aesthetic through the exhibition caseback</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Rose Gold Seikonaut wraps the ultra-thin Nautilus silhouette in 20-micron rose gold PVD plating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case delivers a warm, luxurious tone while keeping the low-profile presence that defines the Seikonaut line. The sapphire crystal is available with clear or blue AR coating, and the screw-down crown provides 50 m water resistance. Compatible with all standard NH-family movements and 30.8 mm dials, this case is built for modders who want rose gold warmth without the bulk of typical Nautilus alternatives.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron rose gold PVD</td></tr><tr><td>Finish</td><td>Brushed and polished rose gold</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Pair with rose gold or warm-toned dials for a cohesive look, or use a contrasting dial color like black or dark green for a two-tone effect.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet in rose gold. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron rose gold PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Rose gold is one of the most requested finishes in the Seiko modding community, but most rose gold cases on the market use thin electroplating that wears through within months. The Seikonaut uses 20-micron PVD (Physical Vapor Deposition) for significantly better durability — the coating bonds at a molecular level rather than sitting on the surface. Combined with the ultra-thin 9.95 mm profile, the result is a rose gold Nautilus case that actually wears like a refined watch rather than a chunky mod. The brushed surfaces catch light differently from the polished accents, adding visual depth that flat plating cannot achieve.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Will the rose gold PVD coating wear off?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The 20-micron PVD coating is significantly more durable than standard electroplating. PVD bonds to the steel at a molecular level, so it resists daily wear, sweat, and minor scratches far better than plating. With normal use, the finish will hold up well over time. Avoid abrasive surfaces and harsh chemicals to maximize longevity.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors pair well with rose gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Rose gold pairs naturally with warm tones — champagne, salmon, and white dials create a cohesive luxury look. For higher contrast, black and dark green dials provide a striking two-tone effect. Our <a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial</a> was designed specifically to match this case finish.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit this case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">All standard Seiko NH-family automatics: NH35, NH36, NH38, NH70, NH71, and NH72. For a full skeleton look through the exhibition caseback, use the <a href="/products/nh72-skeleton-movement">NH72 skeleton movement</a>. The NH72’s golden bridges complement the rose gold case beautifully.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial (30.8 mm)</a> — matching rose gold tone, purpose-built for this case</li><li><a href="/products/royal-oak-hands-v2-rosegold">Rose Gold V2 Hands</a> — brushed rose gold hands to complete the look</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable workhorse movement for a solid daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges that match the rose gold case finish</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Rose Gold Seikonaut wraps the ultra-thin Nautilus silhouette in 20-micron rose gold PVD plating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case delivers a warm, luxurious tone while keeping the low-profile presence that defines the Seikonaut line. The sapphire crystal is available with clear or blue AR coating, and the screw-down crown provides 50 m water resistance. Compatible with all standard NH-family movements and 30.8 mm dials, this case is built for modders who want rose gold warmth without the bulk of typical Nautilus alternatives.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron rose gold PVD</td></tr><tr><td>Finish</td><td>Brushed and polished rose gold</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Pair with rose gold or warm-toned dials for a cohesive look, or use a contrasting dial color like black or dark green for a two-tone effect.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet in rose gold. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron rose gold PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Rose gold is one of the most requested finishes in the Seiko modding community, but most rose gold cases on the market use thin electroplating that wears through within months. The Seikonaut uses 20-micron PVD (Physical Vapor Deposition) for significantly better durability — the coating bonds at a molecular level rather than sitting on the surface. Combined with the ultra-thin 9.95 mm profile, the result is a rose gold Nautilus case that actually wears like a refined watch rather than a chunky mod. The brushed surfaces catch light differently from the polished accents, adding visual depth that flat plating cannot achieve.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Will the rose gold PVD coating wear off?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The 20-micron PVD coating is significantly more durable than standard electroplating. PVD bonds to the steel at a molecular level, so it resists daily wear, sweat, and minor scratches far better than plating. With normal use, the finish will hold up well over time. Avoid abrasive surfaces and harsh chemicals to maximize longevity.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors pair well with rose gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Rose gold pairs naturally with warm tones — champagne, salmon, and white dials create a cohesive luxury look. For higher contrast, black and dark green dials provide a striking two-tone effect. Our <a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial</a> was designed specifically to match this case finish.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit this case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">All standard Seiko NH-family automatics: NH35, NH36, NH38, NH70, NH71, and NH72. For a full skeleton look through the exhibition caseback, use the <a href="/products/nh72-skeleton-movement">NH72 skeleton movement</a>. The NH72’s golden bridges complement the rose gold case beautifully.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial (30.8 mm)</a> — matching rose gold tone, purpose-built for this case</li><li><a href="/products/royal-oak-hands-v2-rosegold">Rose Gold V2 Hands</a> — brushed rose gold hands to complete the look</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable workhorse movement for a solid daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges that match the rose gold case finish</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Rose Gold Seikonaut wraps the ultra-thin Nautilus silhouette in 20-micron rose gold PVD plating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case delivers a warm, luxurious tone while keeping the low-profile presence that defines the Seikonaut line. The sapphire crystal is available with clear or blue AR coating, and the screw-down crown provides 50 m water resistance. Compatible with all standard NH-family movements and 30.8 mm dials, this case is built for modders who want rose gold warmth without the bulk of typical Nautilus alternatives.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron rose gold PVD</td></tr><tr><td>Finish</td><td>Brushed and polished rose gold</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Pair with rose gold or warm-toned dials for a cohesive look, or use a contrasting dial color like black or dark green for a two-tone effect.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet in rose gold. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron rose gold PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Rose gold is one of the most requested finishes in the Seiko modding community, but most rose gold cases on the market use thin electroplating that wears through within months. The Seikonaut uses 20-micron PVD (Physical Vapor Deposition) for significantly better durability — the coating bonds at a molecular level rather than sitting on the surface. Combined with the ultra-thin 9.95 mm profile, the result is a rose gold Nautilus case that actually wears like a refined watch rather than a chunky mod. The brushed surfaces catch light differently from the polished accents, adding visual depth that flat plating cannot achieve.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Will the rose gold PVD coating wear off?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The 20-micron PVD coating is significantly more durable than standard electroplating. PVD bonds to the steel at a molecular level, so it resists daily wear, sweat, and minor scratches far better than plating. With normal use, the finish will hold up well over time. Avoid abrasive surfaces and harsh chemicals to maximize longevity.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors pair well with rose gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Rose gold pairs naturally with warm tones — champagne, salmon, and white dials create a cohesive luxury look. For higher contrast, black and dark green dials provide a striking two-tone effect. Our <a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial</a> was designed specifically to match this case finish.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit this case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">All standard Seiko NH-family automatics: NH35, NH36, NH38, NH70, NH71, and NH72. For a full skeleton look through the exhibition caseback, use the <a href="/products/nh72-skeleton-movement">NH72 skeleton movement</a>. The NH72’s golden bridges complement the rose gold case beautifully.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial (30.8 mm)</a> — matching rose gold tone, purpose-built for this case</li><li><a href="/products/royal-oak-hands-v2-rosegold">Rose Gold V2 Hands</a> — brushed rose gold hands to complete the look</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable workhorse movement for a solid daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges that match the rose gold case finish</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Rose Gold Seikonaut wraps the ultra-thin Nautilus silhouette in 20-micron rose gold PVD plating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case delivers a warm, luxurious tone while keeping the low-profile presence that defines the Seikonaut line. The sapphire crystal is available with clear or blue AR coating, and the screw-down crown provides 50 m water resistance. Compatible with all standard NH-family movements and 30.8 mm dials, this case is built for modders who want rose gold warmth without the bulk of typical Nautilus alternatives.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron rose gold PVD</td></tr><tr><td>Finish</td><td>Brushed and polished rose gold</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Pair with rose gold or warm-toned dials for a cohesive look, or use a contrasting dial color like black or dark green for a two-tone effect.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet in rose gold. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron rose gold PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Rose gold is one of the most requested finishes in the Seiko modding community, but most rose gold cases on the market use thin electroplating that wears through within months. The Seikonaut uses 20-micron PVD (Physical Vapor Deposition) for significantly better durability — the coating bonds at a molecular level rather than sitting on the surface. Combined with the ultra-thin 9.95 mm profile, the result is a rose gold Nautilus case that actually wears like a refined watch rather than a chunky mod. The brushed surfaces catch light differently from the polished accents, adding visual depth that flat plating cannot achieve.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Will the rose gold PVD coating wear off?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The 20-micron PVD coating is significantly more durable than standard electroplating. PVD bonds to the steel at a molecular level, so it resists daily wear, sweat, and minor scratches far better than plating. With normal use, the finish will hold up well over time. Avoid abrasive surfaces and harsh chemicals to maximize longevity.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors pair well with rose gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Rose gold pairs naturally with warm tones — champagne, salmon, and white dials create a cohesive luxury look. For higher contrast, black and dark green dials provide a striking two-tone effect. Our <a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial</a> was designed specifically to match this case finish.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit this case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">All standard Seiko NH-family automatics: NH35, NH36, NH38, NH70, NH71, and NH72. For a full skeleton look through the exhibition caseback, use the <a href="/products/nh72-skeleton-movement">NH72 skeleton movement</a>. The NH72’s golden bridges complement the rose gold case beautifully.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial (30.8 mm)</a> — matching rose gold tone, purpose-built for this case</li><li><a href="/products/royal-oak-hands-v2-rosegold">Rose Gold V2 Hands</a> — brushed rose gold hands to complete the look</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable workhorse movement for a solid daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges that match the rose gold case finish</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Yellow Gold Seikonaut delivers the boldest warm-tone finish in the lineup with a full gold PVD coating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case keeps the ultra-thin Nautilus silhouette while making a deliberate visual statement. The brushed and polished gold surfaces catch light from every angle, and the sapphire crystal is available with clear or blue AR coating. With a screw-down crown rated to 50 m water resistance and compatibility with all NH-family movements and 30.8 mm dials, this case is for builders who want their Nautilus mod to command attention.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with gold PVD</td></tr><tr><td>Finish</td><td>Brushed and polished gold</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gold and champagne dials create a monochromatic luxury look. Black, dark green, and navy dials provide striking contrast against the gold case. White dials give a clean, classic two-tone feel.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet in gold. Standard spring bar attachment at the lugs. Black and dark green rubber straps also pair well with the gold case.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, gold PVD coating)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>A full gold Nautilus is one of the most iconic references in watchmaking, and builders have been asking for a gold Seikonaut since the silver version launched. The challenge with gold PVD cases in the mod market is that most look cheap — the tone is too yellow, the finish is too uniform, or the case is too thick to carry the gold aesthetic convincingly. The Seikonaut gold addresses all three issues: the PVD shade is tuned to a warm but restrained yellow gold, the brushed-and-polished finishing adds the surface variety that genuine gold watches have, and the 9.95 mm thickness avoids the chunky look that undermines most gold mod cases. The result reads like a gold sports watch, not a gold-painted mod.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is the gold case real gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">No. The case is 316L stainless steel with a PVD gold coating. PVD (Physical Vapor Deposition) is more durable and scratch-resistant than traditional gold plating. The look is gold-tone, not solid gold, which keeps the price accessible while delivering the visual impact of a full gold watch. The PVD shade is tuned to a warm, restrained yellow gold rather than the overly bright tone found on cheaper alternatives.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Does the gold PVD match the NH72 movement bridges?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Yes, closely. The NH72 skeleton movement has golden-toned bridges, and the Seikonaut gold PVD shade was selected to complement that tone. Pairing this case with the <a href="/products/nh72-skeleton-movement">NH72</a> and an exhibition caseback creates a unified gold build from case to movement bridges.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What strap or bracelet should I use with the gold case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">A gold Seikonaut integrated bracelet creates the full luxury look. For a sportier feel, a black rubber strap provides maximum contrast and lets the gold case take center stage. Green and navy rubber straps also pair well for a bold color-on-gold combination. </p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is this compared to other gold Nautilus mod cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback, the Gold Seikonaut is one of the thinnest gold Nautilus-style cases available. Most competitors measure 12–14 mm. A thinner gold case reads more like a genuine gold sports watch and less like a plated mod, which is critical for the gold finish to look convincing on the wrist.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial (30.8 mm)</a> — warm-toned skeleton dial for a full gold skeleton build</li><li><a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> — matching gold hands to complete the monochromatic look</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable automatic movement for a solid gold daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges match the gold case for a unified skeleton aesthetic</li><li><a href="/products/nh70-skeleton-movement">Seiko NH70 Skeleton Movement</a> — open-heart alternative for a partially skeletonized gold build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Yellow Gold Seikonaut delivers the boldest warm-tone finish in the lineup with a full gold PVD coating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case keeps the ultra-thin Nautilus silhouette while making a deliberate visual statement. The brushed and polished gold surfaces catch light from every angle, and the sapphire crystal is available with clear or blue AR coating. With a screw-down crown rated to 50 m water resistance and compatibility with all NH-family movements and 30.8 mm dials, this case is for builders who want their Nautilus mod to command attention.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with gold PVD</td></tr><tr><td>Finish</td><td>Brushed and polished gold</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gold and champagne dials create a monochromatic luxury look. Black, dark green, and navy dials provide striking contrast against the gold case. White dials give a clean, classic two-tone feel.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet in gold. Standard spring bar attachment at the lugs. Black and dark green rubber straps also pair well with the gold case.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, gold PVD coating)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>A full gold Nautilus is one of the most iconic references in watchmaking, and builders have been asking for a gold Seikonaut since the silver version launched. The challenge with gold PVD cases in the mod market is that most look cheap — the tone is too yellow, the finish is too uniform, or the case is too thick to carry the gold aesthetic convincingly. The Seikonaut gold addresses all three issues: the PVD shade is tuned to a warm but restrained yellow gold, the brushed-and-polished finishing adds the surface variety that genuine gold watches have, and the 9.95 mm thickness avoids the chunky look that undermines most gold mod cases. The result reads like a gold sports watch, not a gold-painted mod.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is the gold case real gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">No. The case is 316L stainless steel with a PVD gold coating. PVD (Physical Vapor Deposition) is more durable and scratch-resistant than traditional gold plating. The look is gold-tone, not solid gold, which keeps the price accessible while delivering the visual impact of a full gold watch. The PVD shade is tuned to a warm, restrained yellow gold rather than the overly bright tone found on cheaper alternatives.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Does the gold PVD match the NH72 movement bridges?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Yes, closely. The NH72 skeleton movement has golden-toned bridges, and the Seikonaut gold PVD shade was selected to complement that tone. Pairing this case with the <a href="/products/nh72-skeleton-movement">NH72</a> and an exhibition caseback creates a unified gold build from case to movement bridges.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What strap or bracelet should I use with the gold case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">A gold Seikonaut integrated bracelet creates the full luxury look. For a sportier feel, a black rubber strap provides maximum contrast and lets the gold case take center stage. Green and navy rubber straps also pair well for a bold color-on-gold combination. </p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is this compared to other gold Nautilus mod cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback, the Gold Seikonaut is one of the thinnest gold Nautilus-style cases available. Most competitors measure 12–14 mm. A thinner gold case reads more like a genuine gold sports watch and less like a plated mod, which is critical for the gold finish to look convincing on the wrist.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial (30.8 mm)</a> — warm-toned skeleton dial for a full gold skeleton build</li><li><a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> — matching gold hands to complete the monochromatic look</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable automatic movement for a solid gold daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges match the gold case for a unified skeleton aesthetic</li><li><a href="/products/nh70-skeleton-movement">Seiko NH70 Skeleton Movement</a> — open-heart alternative for a partially skeletonized gold build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Yellow Gold Seikonaut delivers the boldest warm-tone finish in the lineup with a full gold PVD coating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case keeps the ultra-thin Nautilus silhouette while making a deliberate visual statement. The brushed and polished gold surfaces catch light from every angle, and the sapphire crystal is available with clear or blue AR coating. With a screw-down crown rated to 50 m water resistance and compatibility with all NH-family movements and 30.8 mm dials, this case is for builders who want their Nautilus mod to command attention.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with gold PVD</td></tr><tr><td>Finish</td><td>Brushed and polished gold</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gold and champagne dials create a monochromatic luxury look. Black, dark green, and navy dials provide striking contrast against the gold case. White dials give a clean, classic two-tone feel.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet in gold. Standard spring bar attachment at the lugs. Black and dark green rubber straps also pair well with the gold case.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, gold PVD coating)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>A full gold Nautilus is one of the most iconic references in watchmaking, and builders have been asking for a gold Seikonaut since the silver version launched. The challenge with gold PVD cases in the mod market is that most look cheap — the tone is too yellow, the finish is too uniform, or the case is too thick to carry the gold aesthetic convincingly. The Seikonaut gold addresses all three issues: the PVD shade is tuned to a warm but restrained yellow gold, the brushed-and-polished finishing adds the surface variety that genuine gold watches have, and the 9.95 mm thickness avoids the chunky look that undermines most gold mod cases. The result reads like a gold sports watch, not a gold-painted mod.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is the gold case real gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">No. The case is 316L stainless steel with a PVD gold coating. PVD (Physical Vapor Deposition) is more durable and scratch-resistant than traditional gold plating. The look is gold-tone, not solid gold, which keeps the price accessible while delivering the visual impact of a full gold watch. The PVD shade is tuned to a warm, restrained yellow gold rather than the overly bright tone found on cheaper alternatives.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Does the gold PVD match the NH72 movement bridges?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Yes, closely. The NH72 skeleton movement has golden-toned bridges, and the Seikonaut gold PVD shade was selected to complement that tone. Pairing this case with the <a href="/products/nh72-skeleton-movement">NH72</a> and an exhibition caseback creates a unified gold build from case to movement bridges.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What strap or bracelet should I use with the gold case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">A gold Seikonaut integrated bracelet creates the full luxury look. For a sportier feel, a black rubber strap provides maximum contrast and lets the gold case take center stage. Green and navy rubber straps also pair well for a bold color-on-gold combination. </p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is this compared to other gold Nautilus mod cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback, the Gold Seikonaut is one of the thinnest gold Nautilus-style cases available. Most competitors measure 12–14 mm. A thinner gold case reads more like a genuine gold sports watch and less like a plated mod, which is critical for the gold finish to look convincing on the wrist.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial (30.8 mm)</a> — warm-toned skeleton dial for a full gold skeleton build</li><li><a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> — matching gold hands to complete the monochromatic look</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable automatic movement for a solid gold daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges match the gold case for a unified skeleton aesthetic</li><li><a href="/products/nh70-skeleton-movement">Seiko NH70 Skeleton Movement</a> — open-heart alternative for a partially skeletonized gold build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Yellow Gold Seikonaut delivers the boldest warm-tone finish in the lineup with a full gold PVD coating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case keeps the ultra-thin Nautilus silhouette while making a deliberate visual statement. The brushed and polished gold surfaces catch light from every angle, and the sapphire crystal is available with clear or blue AR coating. With a screw-down crown rated to 50 m water resistance and compatibility with all NH-family movements and 30.8 mm dials, this case is for builders who want their Nautilus mod to command attention.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with gold PVD</td></tr><tr><td>Finish</td><td>Brushed and polished gold</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gold and champagne dials create a monochromatic luxury look. Black, dark green, and navy dials provide striking contrast against the gold case. White dials give a clean, classic two-tone feel.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet in gold. Standard spring bar attachment at the lugs. Black and dark green rubber straps also pair well with the gold case.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, gold PVD coating)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>A full gold Nautilus is one of the most iconic references in watchmaking, and builders have been asking for a gold Seikonaut since the silver version launched. The challenge with gold PVD cases in the mod market is that most look cheap — the tone is too yellow, the finish is too uniform, or the case is too thick to carry the gold aesthetic convincingly. The Seikonaut gold addresses all three issues: the PVD shade is tuned to a warm but restrained yellow gold, the brushed-and-polished finishing adds the surface variety that genuine gold watches have, and the 9.95 mm thickness avoids the chunky look that undermines most gold mod cases. The result reads like a gold sports watch, not a gold-painted mod.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is the gold case real gold?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">No. The case is 316L stainless steel with a PVD gold coating. PVD (Physical Vapor Deposition) is more durable and scratch-resistant than traditional gold plating. The look is gold-tone, not solid gold, which keeps the price accessible while delivering the visual impact of a full gold watch. The PVD shade is tuned to a warm, restrained yellow gold rather than the overly bright tone found on cheaper alternatives.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Does the gold PVD match the NH72 movement bridges?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Yes, closely. The NH72 skeleton movement has golden-toned bridges, and the Seikonaut gold PVD shade was selected to complement that tone. Pairing this case with the <a href="/products/nh72-skeleton-movement">NH72</a> and an exhibition caseback creates a unified gold build from case to movement bridges.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What strap or bracelet should I use with the gold case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">A gold Seikonaut integrated bracelet creates the full luxury look. For a sportier feel, a black rubber strap provides maximum contrast and lets the gold case take center stage. Green and navy rubber straps also pair well for a bold color-on-gold combination. </p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is this compared to other gold Nautilus mod cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback, the Gold Seikonaut is one of the thinnest gold Nautilus-style cases available. Most competitors measure 12–14 mm. A thinner gold case reads more like a genuine gold sports watch and less like a plated mod, which is critical for the gold finish to look convincing on the wrist.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-rosegold-index">Rose Gold Nautilus Skeleton Dial (30.8 mm)</a> — warm-toned skeleton dial for a full gold skeleton build</li><li><a href="/products/royal-oak-hands-v2-gold">Gold V2 Hands</a> — matching gold hands to complete the monochromatic look</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable automatic movement for a solid gold daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — golden bridges match the gold case for a unified skeleton aesthetic</li><li><a href="/products/nh70-skeleton-movement">Seiko NH70 Skeleton Movement</a> — open-heart alternative for a partially skeletonized gold build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Black Seikonaut takes the ultra-thin Nautilus silhouette into stealth territory with a 20-micron black PVD coating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case delivers the same low-profile presence as the brushed silver version but with a darker, more understated character. The sapphire crystal is available with clear or blue AR coating, and the screw-down crown provides 50 m water resistance. Compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements using 30.8 mm dials — a stealth Nautilus build starts here.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron black PVD</td></tr><tr><td>Finish</td><td>Brushed and polished black</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Black, dark gray, and dark blue dials create a monochromatic stealth look. White or bright-colored dials create a high-contrast tuxedo effect against the black case.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron black PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Black-coated watches occupy a specific niche in the modding community — they read as tactical and understated, which is the opposite of the typical Nautilus aesthetic. That contrast is exactly the point. The Seikonaut’s brushed-and-polished finishing becomes even more nuanced in black PVD: the brushed surfaces absorb light while the polished edges catch it, creating subtle definition that flat matte cases lack. The 20-micron PVD is applied via Physical Vapor Deposition for molecular-level adhesion, making it harder and more scratch-resistant than painted or dipped coatings. At 9.95 mm thick, this is a stealth build that keeps the slim proportions intact.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Does the black PVD scratch easily?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The 20-micron PVD coating is harder and more scratch-resistant than standard plating or paint. However, scratches on dark coatings are more visible than on bare stainless steel because they reveal the lighter metal underneath. With normal daily wear, the finish holds up well. Use care during assembly and avoid abrasive surfaces.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors work best with a black case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">For a full stealth build, use a black or dark gray dial with black or gunmetal hands. For high contrast, a white or silver dial creates a striking tuxedo look. Green and blue dials also pair well, adding a touch of color against the dark case without breaking the overall subdued tone.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit the Black Seikonaut?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">All standard Seiko NH-family automatics: NH35, NH36, NH38, NH70, NH71, and NH72. The <a href="/products/nh35-movement">NH35</a> is the most popular choice for daily-wear builds, while the <a href="/products/nh72-skeleton-movement">NH72 skeleton</a> pairs with the exhibition caseback for a see-through build.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is this case waterproof?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Black Seikonaut is rated to 50 m water resistance when assembled correctly with all gaskets properly seated. This covers hand washing, rain, and light splashes. For submersion, have a watchmaker pressure-test the completed build.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — high contrast against the black case</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — bright hands for legibility against a dark build</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable daily-wear movement, the most popular choice for Seiko mods</li><li><a href="/products/nh70-skeleton-movement">Seiko NH70 Skeleton Movement</a> — open-heart movement for a partially skeletonized stealth build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Black Seikonaut takes the ultra-thin Nautilus silhouette into stealth territory with a 20-micron black PVD coating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case delivers the same low-profile presence as the brushed silver version but with a darker, more understated character. The sapphire crystal is available with clear or blue AR coating, and the screw-down crown provides 50 m water resistance. Compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements using 30.8 mm dials — a stealth Nautilus build starts here.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron black PVD</td></tr><tr><td>Finish</td><td>Brushed and polished black</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Black, dark gray, and dark blue dials create a monochromatic stealth look. White or bright-colored dials create a high-contrast tuxedo effect against the black case.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron black PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Black-coated watches occupy a specific niche in the modding community — they read as tactical and understated, which is the opposite of the typical Nautilus aesthetic. That contrast is exactly the point. The Seikonaut’s brushed-and-polished finishing becomes even more nuanced in black PVD: the brushed surfaces absorb light while the polished edges catch it, creating subtle definition that flat matte cases lack. The 20-micron PVD is applied via Physical Vapor Deposition for molecular-level adhesion, making it harder and more scratch-resistant than painted or dipped coatings. At 9.95 mm thick, this is a stealth build that keeps the slim proportions intact.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Does the black PVD scratch easily?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The 20-micron PVD coating is harder and more scratch-resistant than standard plating or paint. However, scratches on dark coatings are more visible than on bare stainless steel because they reveal the lighter metal underneath. With normal daily wear, the finish holds up well. Use care during assembly and avoid abrasive surfaces.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors work best with a black case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">For a full stealth build, use a black or dark gray dial with black or gunmetal hands. For high contrast, a white or silver dial creates a striking tuxedo look. Green and blue dials also pair well, adding a touch of color against the dark case without breaking the overall subdued tone.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit the Black Seikonaut?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">All standard Seiko NH-family automatics: NH35, NH36, NH38, NH70, NH71, and NH72. The <a href="/products/nh35-movement">NH35</a> is the most popular choice for daily-wear builds, while the <a href="/products/nh72-skeleton-movement">NH72 skeleton</a> pairs with the exhibition caseback for a see-through build.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is this case waterproof?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Black Seikonaut is rated to 50 m water resistance when assembled correctly with all gaskets properly seated. This covers hand washing, rain, and light splashes. For submersion, have a watchmaker pressure-test the completed build.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — high contrast against the black case</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — bright hands for legibility against a dark build</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable daily-wear movement, the most popular choice for Seiko mods</li><li><a href="/products/nh70-skeleton-movement">Seiko NH70 Skeleton Movement</a> — open-heart movement for a partially skeletonized stealth build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Black Seikonaut takes the ultra-thin Nautilus silhouette into stealth territory with a 20-micron black PVD coating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case delivers the same low-profile presence as the brushed silver version but with a darker, more understated character. The sapphire crystal is available with clear or blue AR coating, and the screw-down crown provides 50 m water resistance. Compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements using 30.8 mm dials — a stealth Nautilus build starts here.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron black PVD</td></tr><tr><td>Finish</td><td>Brushed and polished black</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Black, dark gray, and dark blue dials create a monochromatic stealth look. White or bright-colored dials create a high-contrast tuxedo effect against the black case.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron black PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Black-coated watches occupy a specific niche in the modding community — they read as tactical and understated, which is the opposite of the typical Nautilus aesthetic. That contrast is exactly the point. The Seikonaut’s brushed-and-polished finishing becomes even more nuanced in black PVD: the brushed surfaces absorb light while the polished edges catch it, creating subtle definition that flat matte cases lack. The 20-micron PVD is applied via Physical Vapor Deposition for molecular-level adhesion, making it harder and more scratch-resistant than painted or dipped coatings. At 9.95 mm thick, this is a stealth build that keeps the slim proportions intact.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Does the black PVD scratch easily?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The 20-micron PVD coating is harder and more scratch-resistant than standard plating or paint. However, scratches on dark coatings are more visible than on bare stainless steel because they reveal the lighter metal underneath. With normal daily wear, the finish holds up well. Use care during assembly and avoid abrasive surfaces.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors work best with a black case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">For a full stealth build, use a black or dark gray dial with black or gunmetal hands. For high contrast, a white or silver dial creates a striking tuxedo look. Green and blue dials also pair well, adding a touch of color against the dark case without breaking the overall subdued tone.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit the Black Seikonaut?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">All standard Seiko NH-family automatics: NH35, NH36, NH38, NH70, NH71, and NH72. The <a href="/products/nh35-movement">NH35</a> is the most popular choice for daily-wear builds, while the <a href="/products/nh72-skeleton-movement">NH72 skeleton</a> pairs with the exhibition caseback for a see-through build.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is this case waterproof?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Black Seikonaut is rated to 50 m water resistance when assembled correctly with all gaskets properly seated. This covers hand washing, rain, and light splashes. For submersion, have a watchmaker pressure-test the completed build.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — high contrast against the black case</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — bright hands for legibility against a dark build</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable daily-wear movement, the most popular choice for Seiko mods</li><li><a href="/products/nh70-skeleton-movement">Seiko NH70 Skeleton Movement</a> — open-heart movement for a partially skeletonized stealth build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Black Seikonaut takes the ultra-thin Nautilus silhouette into stealth territory with a 20-micron black PVD coating over 316L stainless steel. At 9.95 mm with a solid caseback, this 40 mm case delivers the same low-profile presence as the brushed silver version but with a darker, more understated character. The sapphire crystal is available with clear or blue AR coating, and the screw-down crown provides 50 m water resistance. Compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements using 30.8 mm dials — a stealth Nautilus build starts here.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron black PVD</td></tr><tr><td>Finish</td><td>Brushed and polished black</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Black, dark gray, and dark blue dials create a monochromatic stealth look. White or bright-colored dials create a high-contrast tuxedo effect against the black case.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron black PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Black-coated watches occupy a specific niche in the modding community — they read as tactical and understated, which is the opposite of the typical Nautilus aesthetic. That contrast is exactly the point. The Seikonaut’s brushed-and-polished finishing becomes even more nuanced in black PVD: the brushed surfaces absorb light while the polished edges catch it, creating subtle definition that flat matte cases lack. The 20-micron PVD is applied via Physical Vapor Deposition for molecular-level adhesion, making it harder and more scratch-resistant than painted or dipped coatings. At 9.95 mm thick, this is a stealth build that keeps the slim proportions intact.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Does the black PVD scratch easily?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The 20-micron PVD coating is harder and more scratch-resistant than standard plating or paint. However, scratches on dark coatings are more visible than on bare stainless steel because they reveal the lighter metal underneath. With normal daily wear, the finish holds up well. Use care during assembly and avoid abrasive surfaces.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors work best with a black case?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">For a full stealth build, use a black or dark gray dial with black or gunmetal hands. For high contrast, a white or silver dial creates a striking tuxedo look. Green and blue dials also pair well, adding a touch of color against the dark case without breaking the overall subdued tone.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What movements fit the Black Seikonaut?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">All standard Seiko NH-family automatics: NH35, NH36, NH38, NH70, NH71, and NH72. The <a href="/products/nh35-movement">NH35</a> is the most popular choice for daily-wear builds, while the <a href="/products/nh72-skeleton-movement">NH72 skeleton</a> pairs with the exhibition caseback for a see-through build.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">Is this case waterproof?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">The Black Seikonaut is rated to 50 m water resistance when assembled correctly with all gaskets properly seated. This covers hand washing, rain, and light splashes. For submersion, have a watchmaker pressure-test the completed build.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — high contrast against the black case</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — bright hands for legibility against a dark build</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — reliable daily-wear movement, the most popular choice for Seiko mods</li><li><a href="/products/nh70-skeleton-movement">Seiko NH70 Skeleton Movement</a> — open-heart movement for a partially skeletonized stealth build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Gun Metal Seikonaut sits between the silver and black finishes with a dark gray PVD coating that reads industrial and modern. At 9.95 mm with a solid caseback, this 40 mm case uses the same ultra-thin Nautilus-inspired architecture as the rest of the Seikonaut line, finished in 20-micron gun metal plating over 316L stainless steel. The sapphire crystal comes with clear or blue AR coating, the screw-down crown delivers 50 m water resistance, and the case accepts all NH-family movements with 30.8 mm dials. Gun metal is the most versatile PVD finish in the lineup — it pairs well with almost any dial color and hand set.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron gun metal PVD</td></tr><tr><td>Finish</td><td>Brushed and polished gun metal</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gun metal is the most neutral dark finish in the Seikonaut range — it pairs well with silver, white, blue, green, black, and even gold-toned dials without clashing.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron gun metal PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Gun metal fills a gap in the Seikonaut lineup. Silver is classic, black is stealth, rose gold is warm — but gun metal is the chameleon. Its dark gray tone shifts depending on the light: cooler and darker indoors, warmer and more metallic in direct sunlight. This makes it the easiest finish to pair with different dial and hand combinations. The 20-micron PVD coating is applied via Physical Vapor Deposition for molecular-level adhesion, providing scratch resistance that outperforms standard plating. At 9.95 mm thick, the ultra-thin profile remains consistent across the entire Seikonaut family, regardless of finish.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What is gun metal PVD?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gun metal PVD is a dark gray coating applied to the stainless steel case via Physical Vapor Deposition. The process bonds the coating at a molecular level, making it harder and more durable than traditional plating. The gun metal shade sits between silver and black — darker than natural steel but lighter and warmer than black PVD.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors pair best with gun metal?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gun metal is the most versatile finish in the Seikonaut range. It pairs well with nearly every dial color: silver and white for classic contrast, blue and green for a modern sport look, black for a monochromatic build, and even gold-toned dials for an unexpected warm-cool combination. This neutrality makes gun metal a popular choice for modders who plan multiple dial swaps.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is the Gun Metal Seikonaut compared to other Nautilus cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback and 10.3 mm with exhibition, the Gun Metal Seikonaut is 2–4 mm thinner than most Nautilus-style mod cases, which typically sit between 12 mm and 14 mm. The slimmer profile feels more refined on the wrist and captures the proportions of the original Nautilus design more faithfully.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — classic silver-on-gray contrast</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — bright hands for strong legibility against gun metal</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — the standard choice for a reliable daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — pair with exhibition caseback for a skeleton gun metal build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Gun Metal Seikonaut sits between the silver and black finishes with a dark gray PVD coating that reads industrial and modern. At 9.95 mm with a solid caseback, this 40 mm case uses the same ultra-thin Nautilus-inspired architecture as the rest of the Seikonaut line, finished in 20-micron gun metal plating over 316L stainless steel. The sapphire crystal comes with clear or blue AR coating, the screw-down crown delivers 50 m water resistance, and the case accepts all NH-family movements with 30.8 mm dials. Gun metal is the most versatile PVD finish in the lineup — it pairs well with almost any dial color and hand set.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron gun metal PVD</td></tr><tr><td>Finish</td><td>Brushed and polished gun metal</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gun metal is the most neutral dark finish in the Seikonaut range — it pairs well with silver, white, blue, green, black, and even gold-toned dials without clashing.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron gun metal PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Gun metal fills a gap in the Seikonaut lineup. Silver is classic, black is stealth, rose gold is warm — but gun metal is the chameleon. Its dark gray tone shifts depending on the light: cooler and darker indoors, warmer and more metallic in direct sunlight. This makes it the easiest finish to pair with different dial and hand combinations. The 20-micron PVD coating is applied via Physical Vapor Deposition for molecular-level adhesion, providing scratch resistance that outperforms standard plating. At 9.95 mm thick, the ultra-thin profile remains consistent across the entire Seikonaut family, regardless of finish.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What is gun metal PVD?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gun metal PVD is a dark gray coating applied to the stainless steel case via Physical Vapor Deposition. The process bonds the coating at a molecular level, making it harder and more durable than traditional plating. The gun metal shade sits between silver and black — darker than natural steel but lighter and warmer than black PVD.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors pair best with gun metal?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gun metal is the most versatile finish in the Seikonaut range. It pairs well with nearly every dial color: silver and white for classic contrast, blue and green for a modern sport look, black for a monochromatic build, and even gold-toned dials for an unexpected warm-cool combination. This neutrality makes gun metal a popular choice for modders who plan multiple dial swaps.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is the Gun Metal Seikonaut compared to other Nautilus cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback and 10.3 mm with exhibition, the Gun Metal Seikonaut is 2–4 mm thinner than most Nautilus-style mod cases, which typically sit between 12 mm and 14 mm. The slimmer profile feels more refined on the wrist and captures the proportions of the original Nautilus design more faithfully.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — classic silver-on-gray contrast</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — bright hands for strong legibility against gun metal</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — the standard choice for a reliable daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — pair with exhibition caseback for a skeleton gun metal build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Gun Metal Seikonaut sits between the silver and black finishes with a dark gray PVD coating that reads industrial and modern. At 9.95 mm with a solid caseback, this 40 mm case uses the same ultra-thin Nautilus-inspired architecture as the rest of the Seikonaut line, finished in 20-micron gun metal plating over 316L stainless steel. The sapphire crystal comes with clear or blue AR coating, the screw-down crown delivers 50 m water resistance, and the case accepts all NH-family movements with 30.8 mm dials. Gun metal is the most versatile PVD finish in the lineup — it pairs well with almost any dial color and hand set.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron gun metal PVD</td></tr><tr><td>Finish</td><td>Brushed and polished gun metal</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gun metal is the most neutral dark finish in the Seikonaut range — it pairs well with silver, white, blue, green, black, and even gold-toned dials without clashing.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron gun metal PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Gun metal fills a gap in the Seikonaut lineup. Silver is classic, black is stealth, rose gold is warm — but gun metal is the chameleon. Its dark gray tone shifts depending on the light: cooler and darker indoors, warmer and more metallic in direct sunlight. This makes it the easiest finish to pair with different dial and hand combinations. The 20-micron PVD coating is applied via Physical Vapor Deposition for molecular-level adhesion, providing scratch resistance that outperforms standard plating. At 9.95 mm thick, the ultra-thin profile remains consistent across the entire Seikonaut family, regardless of finish.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What is gun metal PVD?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gun metal PVD is a dark gray coating applied to the stainless steel case via Physical Vapor Deposition. The process bonds the coating at a molecular level, making it harder and more durable than traditional plating. The gun metal shade sits between silver and black — darker than natural steel but lighter and warmer than black PVD.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors pair best with gun metal?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gun metal is the most versatile finish in the Seikonaut range. It pairs well with nearly every dial color: silver and white for classic contrast, blue and green for a modern sport look, black for a monochromatic build, and even gold-toned dials for an unexpected warm-cool combination. This neutrality makes gun metal a popular choice for modders who plan multiple dial swaps.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is the Gun Metal Seikonaut compared to other Nautilus cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback and 10.3 mm with exhibition, the Gun Metal Seikonaut is 2–4 mm thinner than most Nautilus-style mod cases, which typically sit between 12 mm and 14 mm. The slimmer profile feels more refined on the wrist and captures the proportions of the original Nautilus design more faithfully.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — classic silver-on-gray contrast</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — bright hands for strong legibility against gun metal</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — the standard choice for a reliable daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — pair with exhibition caseback for a skeleton gun metal build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
<p>The Gun Metal Seikonaut sits between the silver and black finishes with a dark gray PVD coating that reads industrial and modern. At 9.95 mm with a solid caseback, this 40 mm case uses the same ultra-thin Nautilus-inspired architecture as the rest of the Seikonaut line, finished in 20-micron gun metal plating over 316L stainless steel. The sapphire crystal comes with clear or blue AR coating, the screw-down crown delivers 50 m water resistance, and the case accepts all NH-family movements with 30.8 mm dials. Gun metal is the most versatile PVD finish in the lineup — it pairs well with almost any dial color and hand set.</p><h2>Specifications</h2><table><thead><tr><th>Specification</th><th>Value</th></tr></thead><tbody><tr><td>Diameter</td><td>40 mm (10H–4H) × 38 mm (12H–6H)</td></tr><tr><td>Thickness</td><td>9.95 mm (solid caseback) / 10.3 mm (exhibition caseback)</td></tr><tr><td>Material</td><td>316L Stainless Steel with 20-micron gun metal PVD</td></tr><tr><td>Finish</td><td>Brushed and polished gun metal</td></tr><tr><td>Crystal</td><td>Sapphire (clear or blue AR coating)</td></tr><tr><td>Water Resistance</td><td>50 m</td></tr><tr><td>Dial Fit</td><td>30.8 mm</td></tr><tr><td>Crown</td><td>Screw-down, included</td></tr></tbody></table><h2>Compatibility</h2><p><strong>Movements:</strong> NH35, NH36, NH38, NH70, NH71, NH72 — all standard Seiko NH-family automatics fit without modification. The crown stem must be cut to length during installation.</p><p><strong>Dials:</strong> 30.8 mm dials only. Gun metal is the most neutral dark finish in the Seikonaut range — it pairs well with silver, white, blue, green, black, and even gold-toned dials without clashing.</p><p><strong>Strap/Bracelet:</strong> Compatible with the Seikonaut integrated bracelet. Standard spring bar attachment at the lugs.</p><p><strong>Not compatible:</strong> 7S26 and 7S36 movements use a different stem height and are not recommended for this case.</p><h3>What’s Included</h3><ul><li>Seikonaut case body (316L steel, 20-micron gun metal PVD)</li><li>Caseback (solid or exhibition, depending on variant selected)</li><li>Screw-down crown</li><li>Crystal gasket and caseback gasket</li><li>Sapphire crystal (pre-installed, clear or blue AR coating)</li></ul><p><em>Tools are not included. You will need a case opener, hand press, stem cutter, movement holder, and rodico to complete your build.</em></p><h2>Why We Chose This Case</h2><p>Gun metal fills a gap in the Seikonaut lineup. Silver is classic, black is stealth, rose gold is warm — but gun metal is the chameleon. Its dark gray tone shifts depending on the light: cooler and darker indoors, warmer and more metallic in direct sunlight. This makes it the easiest finish to pair with different dial and hand combinations. The 20-micron PVD coating is applied via Physical Vapor Deposition for molecular-level adhesion, providing scratch resistance that outperforms standard plating. At 9.95 mm thick, the ultra-thin profile remains consistent across the entire Seikonaut family, regardless of finish.</p><h2>Frequently Asked Questions</h2><div itemscope itemtype="https://schema.org/FAQPage"><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What is gun metal PVD?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gun metal PVD is a dark gray coating applied to the stainless steel case via Physical Vapor Deposition. The process bonds the coating at a molecular level, making it harder and more durable than traditional plating. The gun metal shade sits between silver and black — darker than natural steel but lighter and warmer than black PVD.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">What dial colors pair best with gun metal?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">Gun metal is the most versatile finish in the Seikonaut range. It pairs well with nearly every dial color: silver and white for classic contrast, blue and green for a modern sport look, black for a monochromatic build, and even gold-toned dials for an unexpected warm-cool combination. This neutrality makes gun metal a popular choice for modders who plan multiple dial swaps.</p></div></div><div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"><h3 itemprop="name">How thin is the Gun Metal Seikonaut compared to other Nautilus cases?</h3><div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"><p itemprop="text">At 9.95 mm with a solid caseback and 10.3 mm with exhibition, the Gun Metal Seikonaut is 2–4 mm thinner than most Nautilus-style mod cases, which typically sit between 12 mm and 14 mm. The slimmer profile feels more refined on the wrist and captures the proportions of the original Nautilus design more faithfully.</p></div></div></div><h2>Complete Your Build</h2><ul><li><a href="/products/nautilus-skeleton-dial-30-8mm-silver-index">Silver Nautilus Skeleton Dial (30.8 mm)</a> — classic silver-on-gray contrast</li><li><a href="/products/royal-oak-hands-v2-silver">Silver V2 Hands</a> — bright hands for strong legibility against gun metal</li><li><a href="/products/nh35-movement">Seiko NH35 Movement</a> — the standard choice for a reliable daily-wear build</li><li><a href="/products/nh72-skeleton-movement">Seiko NH72 Skeleton Movement</a> — pair with exhibition caseback for a skeleton gun metal build</li></ul><h2>Browse Collection</h2><p><a href="/collections/nautilus-style-parts">Nautilus-Style Seiko Mod Parts</a> · <a href="/collections/seiko-mod-cases">All Seiko Mod Cases</a> · <a href="/collections/seiko-nautilus">Nautilus Seiko Mods</a></p><p><em>Nomods is an independent brand. Our products are original designs inspired by iconic watch aesthetics. We are not affiliated with or endorsed by any luxury watch manufacturer. All brand names are used for reference purposes only.</em></p>
De Seikonaut 40mm is een van de dunste Nautilus-stijl Seiko mod-kasten die er zijn — slechts 9,95 mm bij de gesloten kastbodem. CNC-gefreesd uit 316L roestvrij staal met geborstelde en gepolijste oppervlakteafwerking, heeft deze 40 mm-kast een silhouet met geïntegreerde lugs, geïnspireerd op de iconische Nautilus-vorm, verkrijgbaar in zes afwerkingen (zilver, zwart, goud, roségoud, two-tone goud, gunmetal). Het meegeleverde saffierglas komt met je keuze uit heldere of blauwe AR-coating, en de schroefkroon levert 50 m waterdichtheid. Compatibel met NH35-, NH36-, NH38-, NH70-, NH71- en NH72-uurwerken met 30,8 mm-wijzerplaten — lees verder voor volledige specificaties, compatibiliteitsdetails en afwerkingsadvies.
Verkrijgbaar in 6 afwerkingen
Ga naar: Zilver · Zwart · Goud · Roségoud · Two-tone goud · Gunmetal
Zilver — geborsteld staal met gepolijste accenten
De strakste, veelzijdigste afwerking. Geborstelde 316L-oppervlakken met gepolijste schuinkantovergangen vangen licht zonder slijtage te tonen. De allroundkeuze die bij elke wijzerplaat en elke band past.
Zwart — volledige PVD-gecoate stealth-afwerking
Een volledige physical-vapor-deposition-coating over het kastlichaam, de armband en de kastbodem. De matte tonaliteit oogt overdag dressy-stealth en verdwijnt volledig bij weinig licht. Combineert sterk met skeletonwijzerplaten en donkergetinte wijzers.
Goud — warme geelgouden champagnetint
Geelgoud PVD met een champagnewarmte in de geborstelde oppervlakken. De nettste van de warmgetinte afwerkingen; combineert traditioneel met crème- of champagnewijzerplaten en bruin leer, gedurfder met diepblauwe of zwart-skeletonwijzerplaten.
Roségoud — zachte roze-gouden dresstint
Roze-goud PVD aangebracht met lagere kleurverzadiging dan de gele variant — oogt warm en ingetogen, de nettste van de zes afwerkingen. Combineert bijzonder goed met witte, ivoorkleurige of chocoladekleurige wijzerplaten.
Two-tone goud — geborsteld staal met gepolijste gouden accenten
Een duo-afwerking — geborsteld zilveren kastlichaam met gepolijste gouden bezel, kroon en centrale armbandschakels. Overbrugt de zilveren en gouden opties voor builds die zich niet op één tint vastleggen. Vaak een champagne- of bi-kleurconfiguratie genoemd.
Gunmetal — diep koelgrijs met rokerige afwerking
Een koelere tonale neef van zwart PVD — dieper dan staal, lichter dan volledig zwart, met een vage warmgrijze ondertoon. De meest ongebruikelijke afwerking; combineert kenmerkend met geborsteld-stalen wijzerplaten of aardetinten leer.
Specificaties
| Specificatie | Waarde |
|---|---|
| Diameter | 40 mm (10H–4H) — 38 mm (12H–6H) |
| Dikte | 9,95 mm (gesloten kastbodem) / 10,3 mm (exhibition-kastbodem) |
| Materiaal | 316L roestvrij staal |
| Afwerking | Geborsteld met gepolijste accenten |
| Glas | Saffier (heldere of blauwe AR-coating) |
| Waterdichtheid | 50 m |
| Wijzerplaatpassing | 30,8 mm |
| Kroon | Schroefbaar, inbegrepen |
Compatibiliteit
Uurwerken: NH35, NH36, NH38, NH70, NH71, NH72 — alle standaard automatische uurwerken uit de Seiko NH-familie passen zonder aanpassing. De kroonstelstang moet tijdens de installatie op lengte worden geknipt.
Wijzerplaten: Alleen 30,8 mm-wijzerplaten. Deze kast accepteert geen 28,5 mm-wijzerplaten zonder afstandsring. Combineer hem met onze Nautilus skeletonwijzerplaat 30,8mm voor een skeletonbuild, of met elke andere 30,8 mm-wijzerplaat ontworpen voor de NH35-familie.
Armband: Roestvrijstalen geïntegreerde Seikonaut-armband inbegrepen bij de kast. Standaard veerstaafjesbevestiging bij de lugs, dus je kunt naar een rubberen of leren band wisselen als je dat verkiest.
Niet compatibel: 7S26- en 7S36-uurwerken gebruiken een andere stelstanghoogte en worden niet aanbevolen voor deze kast.
Wat is inbegrepen
- Seikonaut 40mm-kastlichaam in je gekozen afwerking (316L roestvrij staal)
- Saffierglas in je gekozen AR-coating (helder of blauw)
- Kastbodem in je gekozen configuratie (gesloten of exhibition)
- Schroefkroon
- Roestvrijstalen geïntegreerde Seikonaut-armband
- Pakkingen (voorgemonteerd)
Gereedschap is niet inbegrepen. Je hebt een kastopener, wijzerpers, stelstangknipper en uurwerkhouder nodig voor de assemblage.
Ontworpen door Nomods
De Seikonaut is onze interpretatie van de ultradunne Nautilus-stijlkast voor Seiko mods. Het 9,95 mm gesloten-kastbodemprofiel is de dunste configuratie die we maken, ontworpen voor bouwers die het Nautilus-silhouet met geïntegreerde lugs in een dress-watch-profiel willen. De exhibition-kastbodem voegt 0,35 mm toe voor skeletonbuilds waarbij je het uurwerk zichtbaar wilt hebben. Elke kast wordt individueel gecontroleerd op borstelconsistentie, randscherpte en glaszetting voordat hij verzonden wordt.
Maak je build compleet
Combineer de Seikonaut 40mm-kast met deze compatibele componenten:
- NH35-uurwerk — het standaard automatische uurwerk voor deze kast
- NH72-skeletonuurwerk — voor skeletonbuilds met de exhibition-kastbodem
- Zilveren V2-wijzers — Nautilus-compatibele wijzers in geborsteld zilver
Bekijk de collectie
Nautilus Style Mod onderdelen — Alle Seiko Mod Cases — Alle Seiko Nautilus Mods
Nomods is een onafhankelijk merk dat gespecialiseerd is in Seiko-compatibele horlogemodificaties. Wij zijn niet gelieerd aan, goedgekeurd door of verbonden met Seiko, Rolex, Audemars Piguet, Patek Philippe of enig ander horlogemerk dat op deze site wordt genoemd. Alle merknamen en handelsmerken zijn eigendom van hun respectieve eigenaren en worden uitsluitend voor beschrijvende en vergelijkende doeleinden gebruikt.
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