{"title":"Best seller Seiko Modding Cases","description":"\u003ch2 data-start=\"219\" data-end=\"248\"\u003eBest Seiko Modding Cases\u003c\/h2\u003e\n\u003cp data-start=\"249\" data-end=\"479\"\u003eThis collection features our best Seiko modding cases, designed for watch modders who value both style and precision. A reliable case is the foundation of every Seiko mod, shaping the look, comfort, and durability of your build.\u003c\/p\u003e\n\u003ch2 data-start=\"481\" data-end=\"513\"\u003eThe Role of Seiko Mod Cases\u003c\/h2\u003e\n\u003cp data-start=\"514\" data-end=\"831\"\u003eIn Seiko modding, the case defines the watch’s personality. From slim and minimal cases to bold and angular styles, each design influences how a Seiko mod watch feels on the wrist. High-quality cases ensure compatibility with Seiko movements and parts, making them essential for both beginners and advanced modders.\u003c\/p\u003e\n\u003ch2 data-start=\"833\" data-end=\"869\"\u003ePopular Styles in Seiko Modding\u003c\/h2\u003e\n\u003cp data-start=\"870\" data-end=\"1190\"\u003eAmong the most admired builds are the \u003cstrong data-start=\"908\" data-end=\"941\"\u003eSeiko mod Royal Oak (Seikoak)\u003c\/strong\u003e and the \u003cstrong data-start=\"950\" data-end=\"972\"\u003eSeiko mod Nautilus\u003c\/strong\u003e. Their distinctive case shapes have inspired countless modders worldwide. These Seiko modding cases combine unique aesthetics with the trusted reliability of Seiko, creating watches that stand out in any collection.\u003c\/p\u003e\n\u003ch2 data-start=\"1192\" data-end=\"1219\"\u003eExplore the Collection\u003c\/h2\u003e\n\u003cp data-start=\"1220\" data-end=\"1501\"\u003eWhether you’re starting your first build or refining your next project, these best Seiko modding cases represent the most popular and versatile choices in the community. Each case provides a solid foundation for creating a Seiko mod watch that is both durable and uniquely yours.\u003c\/p\u003e","products":[{"product_id":"petrichor-37mm-case","title":"Petrichor 37mm Case","description":"\u003cp\u003eThe Silver Petrichor is a Nomods original — not a homage to any existing watch, but a design language we developed from scratch. Inspired by the flowing curves of 1960s and 1970s vintage watchmaking, the Petrichor case features soft, organic lines that set it apart from the angular profiles dominating the mod scene. Machined from 316L stainless steel with a brushed silver finish, fitted with a domed sapphire crystal, and sized at 37 mm for a refined wrist presence. Compatible with NH35 and NH36 movements, this case is ready for your next build.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e37 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e316L Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eBrushed silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrystal\u003c\/td\u003e\n\u003ctd\u003eDomed sapphire (pre-installed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMovement Compatibility\u003c\/td\u003e\n\u003ctd\u003eNH35, NH36\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDial Fit\u003c\/td\u003e\n\u003ctd\u003e28.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrown\u003c\/td\u003e\n\u003ctd\u003eScrew-down, included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBracelet\u003c\/td\u003e\n\u003ctd\u003eIntegrated stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Resistance\u003c\/td\u003e\n\u003ctd\u003eDepends on proper gasket installation during assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eMovements:\u003c\/strong\u003e NH35 and NH36. The Petrichor is designed primarily for these two movements — unlike the Seikonaut case, which also accepts NH7x skeleton movements. If you plan to build a skeleton Petrichor, you will need the NH72 movement, which shares the same dimensions as the NH35.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDials:\u003c\/strong\u003e 28.5 mm. Compatible with Royal Oak style dials, waffle dials, and other 28.5 mm dials designed for NH35-based builds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHands:\u003c\/strong\u003e Any NH-series compatible hands (hour 1.50 mm, minute 0.88 mm, seconds 0.20 mm).\u003c\/p\u003e\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePetrichor case body (316L stainless steel, brushed silver finish)\u003c\/li\u003e\n\u003cli\u003eDomed sapphire crystal (pre-installed)\u003c\/li\u003e\n\u003cli\u003eCrown (screw-down)\u003c\/li\u003e\n\u003cli\u003eGaskets (pre-installed)\u003c\/li\u003e\n\u003cli\u003eIntegrated stainless steel bracelet\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eTools are not included. You will need a case opener, hand press, stem cutter, and movement holder for assembly.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eDesigned by Nomods\u003c\/h2\u003e\n\u003cp\u003eThe Petrichor is our own design. We did not set out to replicate an existing watch — we wanted to create something that felt like it could have come from the golden era of case design in the 1960s and 1970s, when curves were generous and cases hugged the wrist. The domed sapphire crystal is central to this vision: instead of a tall, flat crystal sitting above a deep rehaut, the dome follows the case contour, keeping the overall profile slim. Every case is individually checked for finishing quality — brushing consistency, edge sharpness, and crystal seating — before shipping.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv itemscope itemtype=\"https:\/\/schema.org\/FAQPage\"\u003e\n\u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eWhat movements fit the Petrichor case?\u003c\/h3\u003e\n\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cp itemprop=\"text\"\u003eThe Petrichor is designed for the NH35 and NH36 movements. The NH72 skeleton movement also fits, as it shares the same external dimensions as the NH35. Other NH-series movements with the same footprint are compatible as well.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eWhat dial size fits the Petrichor?\u003c\/h3\u003e\n\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cp itemprop=\"text\"\u003e28.5 mm dials. This includes Royal Oak style dials, waffle dials, and other aftermarket 28.5 mm dials designed for NH35-based builds. Do not use 30.8 mm dials — they will not fit this 37 mm case.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eDoes the Petrichor fit NH72 or NH70 skeleton movements?\u003c\/h3\u003e\n\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cp itemprop=\"text\"\u003eThe NH72 fits because it shares the same case dimensions as the NH35. The NH70 also has the same footprint. However, the Petrichor was primarily designed and tested with the NH35 and NH36. For a skeleton build, the NH72 is the recommended choice.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eIs the Petrichor a Royal Oak homage?\u003c\/h3\u003e\n\u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\u003cp itemprop=\"text\"\u003eNo. The Petrichor is an original Nomods design. It does not replicate the Royal Oak, Nautilus, or any other existing watch. The design draws inspiration from the broad aesthetic movement of 1960s and 1970s vintage watchmaking — an era defined by flowing curves and integrated case designs — but the Petrichor’s specific lines, proportions, and details are entirely our own.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eComplete Your Build\u003c\/h2\u003e\n\u003cp\u003ePair the Silver Petrichor case with these compatible components:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-de\/products\/nh35-movement\"\u003eNH35 Movement\u003c\/a\u003e — the recommended automatic movement for this case\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-de\/products\/royal-oak-skeleton-dial-v1-28-5mm-silver\"\u003eSilver Royal Oak 28.5mm Dial\u003c\/a\u003e — matches the brushed silver case finish\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-de\/products\/waffle-dial-28-5mm\"\u003eSilver-White Waffle Dial (28.5mm)\u003c\/a\u003e — textured dial with a light, clean look\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-de\/products\/royal-oak-hands-v2-silver\"\u003eSilver V2 Hands\u003c\/a\u003e — brushed silver hands to match the case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBrowse Collection\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/en-de\/collections\/petrichor-style-parts\"\u003ePetrichor 37mm Seiko Mod Parts\u003c\/a\u003e · \u003ca href=\"\/en-de\/collections\/seiko-mod-cases\"\u003eAll Seiko Mod Cases\u003c\/a\u003e · \u003ca href=\"\/en-de\/collections\/petrichor-case\"\u003ePetrichor Watch Modding Case\u003c\/a\u003e · \u003ca href=\"\/en-de\/collections\/seiko-mod-petrichor-37mm\"\u003eSeiko Mod Petrichor 37mm\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNomods 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.\u003c\/em\u003e\u003c\/p\u003e","brand":"Nomods","offers":[{"title":"Silver \/ Exhibition","offer_id":43323073527898,"sku":"PET-C-SIL","price":195.0,"currency_code":"USD","in_stock":false},{"title":"Silver \/ Solid","offer_id":43575336271962,"sku":null,"price":195.0,"currency_code":"USD","in_stock":true},{"title":"Rose Gold \/ Exhibition","offer_id":43323073560666,"sku":"PET-C-RSG","price":195.0,"currency_code":"USD","in_stock":true},{"title":"Rose Gold \/ Solid","offer_id":43575336304730,"sku":null,"price":195.0,"currency_code":"USD","in_stock":false},{"title":"Gold \/ Exhibition","offer_id":43323073593434,"sku":"PET-C-GLD","price":195.0,"currency_code":"USD","in_stock":true},{"title":"Gold \/ Solid","offer_id":43575336337498,"sku":null,"price":195.0,"currency_code":"USD","in_stock":false},{"title":"Black PVD \/ Exhibition","offer_id":43323073626202,"sku":"PET-C-BLK","price":195.0,"currency_code":"USD","in_stock":true},{"title":"Black PVD \/ Solid","offer_id":43575336370266,"sku":null,"price":195.0,"currency_code":"USD","in_stock":false},{"title":"Gunmetal \/ Exhibition","offer_id":43323073658970,"sku":"PET-C-GUN","price":195.0,"currency_code":"USD","in_stock":true},{"title":"Gunmetal \/ Solid","offer_id":43575336403034,"sku":null,"price":195.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0601\/2151\/4074\/files\/nomods-petrichor-seiko-mod-case-silver-1169983282.png?v=1748246890"},{"product_id":"royal-oak-37mm-v2-case","title":"Royal Oak 37mm V2 Case","description":"\u003cp\u003eThe V2 Ultrathin Silver Royal Oak case in brushed 316L stainless steel — at just 9.95 mm thick with a solid caseback, this is one of the thinnest Royal Oak-style cases available for Seiko modding. The angular octagonal bezel and integrated lugs capture the iconic sports-luxury silhouette at 37 mm diameter with 48 mm lug-to-lug reach. Sapphire crystal with your choice of blue or clear anti-reflective coating, screw-down crown, and 100 m water resistance. Compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements. Choose between a solid caseback at 9.95 mm or an exhibition caseback at 10.3 mm to display your movement.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e37 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLug-to-Lug\u003c\/td\u003e\n\u003ctd\u003e48 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e9.95 mm (solid) \/ 10.3 mm (exhibition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e316L Stainless Steel, brushed silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 30.1984%;\"\u003eBracelet\u003c\/td\u003e\n\u003ctd style=\"width: 67.3412%;\"\u003eIncluded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrystal\u003c\/td\u003e\n\u003ctd\u003eSapphire (Blue AR or Clear AR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Resistance\u003c\/td\u003e\n\u003ctd\u003e100 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDial Fit\u003c\/td\u003e\n\u003ctd\u003e28.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrown\u003c\/td\u003e\n\u003ctd\u003eScrew-down\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eMovements:\u003c\/strong\u003e NH35, NH36, NH38, NH70, NH71, NH72. All Seiko NH-family movements with the standard 3 o’clock crown position fit this case directly. Not compatible with 7S26 or 7S36 movements due to different stem specifications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDials:\u003c\/strong\u003e 28.5 mm direct fit. Standard Seiko mod dials in this size drop in without modification.\u003c\/p\u003e\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCase body (brushed silver 316L stainless steel)\u003c\/li\u003e\n\u003cli\u003eBracelet\u003c\/li\u003e\n\u003cli\u003eSapphire crystal (pre-installed, optional Blue AR or Clear AR)\u003c\/li\u003e\n\u003cli\u003eCaseback (optional solid or exhibition)\u003c\/li\u003e\n\u003cli\u003eCrown\u003c\/li\u003e\n\u003cli\u003eCrystal gasket (pre-installed)\u003c\/li\u003e\n\u003cli\u003eCaseback gasket (pre-installed)\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eMovement, dial, hands, and tools are not included.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eWhy the V2 Ultrathin\u003c\/h2\u003e\n\u003cp\u003eThe V2 is the second generation of our Royal Oak 37mm case — redesigned from the ground up to reduce thickness without sacrificing water resistance. At 9.95 mm with a solid caseback, it is one of the slimmest Royal Oak-inspired Seiko mod cases on the market. Most competing cases in this style sit above 11 mm. The angular octagonal geometry follows the proportions of the original Royal Oak — brushed flat surfaces, polished rehaut, and integrated lugs that flow into the bracelet attachment — at a fraction of the price. The silver finish is the most versatile in the lineup: natural 316L steel requires no coating, making it the most scratch-tolerant option available.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv itemscope=\"\" itemtype=\"https:\/\/schema.org\/FAQPage\"\u003e\n\u003cdiv itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eWhat movements fit this case?\u003c\/h3\u003e\n\u003cdiv itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n\u003cp itemprop=\"text\"\u003eThe Royal Oak 37mm V2 case accepts Seiko NH35, NH36, NH38, NH70, NH71, and NH72 movements. All share the same case fitment and crown position. The 7S26 and 7S36 movements are not compatible due to a different stem specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eWhat is the difference between solid and exhibition caseback?\u003c\/h3\u003e\n\u003cdiv itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n\u003cp itemprop=\"text\"\u003eThe solid caseback gives the case its thinnest profile at 9.95 mm and provides a clean, sealed back. The exhibition caseback has a sapphire window that lets you see the movement inside, but adds 0.35 mm for a total thickness of 10.3 mm. Both maintain 100 m water resistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n\u003ch3 itemprop=\"name\"\u003eWhat dial size fits this case?\u003c\/h3\u003e\n\u003cdiv itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n\u003cp itemprop=\"text\"\u003e28.5 mm dials fit directly. This is the standard Seiko mod dial size used across Royal Oak 37mm, Nautilus, and other 37 mm platforms. Check our \u003ca href=\"\/en-de\/collections\/royal-oak-style-parts\"\u003eRoyal Oak parts collection\u003c\/a\u003e for compatible dials.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eComplete Your Build\u003c\/h2\u003e\n\u003cp\u003ePair the silver case with matching components:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDials:\u003c\/strong\u003e \u003ca href=\"\/en-de\/products\/royal-oak-skeleton-dial-v1-28-5mm\"\u003eSilver dial\u003c\/a\u003e · \u003ca href=\"\/en-de\/products\/waffle-dial-28-5mm\"\u003eSilver waffle dial\u003c\/a\u003e · \u003ca href=\"\/en-de\/products\/waffle-dial-28-5mm\"\u003eBlue waffle dial\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkeleton dials:\u003c\/strong\u003e \u003ca href=\"\/en-de\/products\/royal-oak-skeleton-dial-v2-28-5mm\"\u003eSilver skeleton V2\u003c\/a\u003e · \u003ca href=\"\/en-de\/products\/royal-oak-skeleton-dial-v2-28-5mm\"\u003eGold skeleton V2\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHands:\u003c\/strong\u003e \u003ca href=\"\/en-de\/products\/royal-oak-hands-v2\"\u003eSilver V2 hands\u003c\/a\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eMovements:\u003c\/strong\u003e \u003ca href=\"\/en-de\/products\/nh35-movement\"\u003eNH35\u003c\/a\u003e · \u003ca href=\"\/en-de\/products\/nh72-skeleton-movement\"\u003eNH72\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBrowse all \u003ca href=\"\/en-de\/collections\/royal-oak-37mm-case\"\u003eRoyal Oak 37mm cases\u003c\/a\u003e · \u003ca href=\"\/en-de\/collections\/recommended-with-37mm-royal-oak-seiko-modding-case\"\u003eRecommended with 37mm Royal Oak\u003c\/a\u003e · \u003ca href=\"\/en-de\/collections\/royal-oak-style-parts\"\u003eRoyal Oak parts\u003c\/a\u003e · \u003ca href=\"\/en-de\/collections\/seiko-mod-cases\"\u003eAll cases\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNomods 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.\u003c\/em\u003e\u003c\/p\u003e","brand":"Nomods","offers":[{"title":"Silver \/ Blue AR \/ Solid","offer_id":43323073921114,"sku":"RO37-C-V2-SIL-SC-BA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Silver \/ Blue AR \/ Exhibition","offer_id":43323073953882,"sku":"RO37-C-V2-SIL-EC-BA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Silver \/ Clear AR \/ Solid","offer_id":43323073986650,"sku":"RO37-C-V2-SIL-SC-CA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Silver \/ Clear AR \/ Exhibition","offer_id":43323074019418,"sku":"RO37-C-V2-SIL-EC-CA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Rose Gold \/ Blue AR \/ Solid","offer_id":43323074052186,"sku":"RO37-C-V2-RSG-SC-BA","price":149.0,"currency_code":"USD","in_stock":true},{"title":"Rose Gold \/ Blue AR \/ Exhibition","offer_id":43323074084954,"sku":"RO37-C-V2-RSG-EC-BA","price":149.0,"currency_code":"USD","in_stock":true},{"title":"Rose Gold \/ Clear AR \/ Solid","offer_id":43323074117722,"sku":"RO37-C-V2-RSG-SC-CA","price":149.0,"currency_code":"USD","in_stock":true},{"title":"Rose Gold \/ Clear AR \/ Exhibition","offer_id":43323074150490,"sku":"RO37-C-V2-RSG-EC-CA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Gunmetal \/ Blue AR \/ Solid","offer_id":43323074183258,"sku":"RO37-C-V2-GUN-SC-BA","price":149.0,"currency_code":"USD","in_stock":true},{"title":"Gunmetal \/ Blue AR \/ Exhibition","offer_id":43323074216026,"sku":"RO37-C-V2-GUN-EC-BA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Gunmetal \/ Clear AR \/ Solid","offer_id":43323074248794,"sku":"RO37-C-V2-GUN-SC-CA","price":149.0,"currency_code":"USD","in_stock":true},{"title":"Gunmetal \/ Clear AR \/ Exhibition","offer_id":43323074281562,"sku":"RO37-C-V2-GUN-EC-CA","price":149.0,"currency_code":"USD","in_stock":true},{"title":"Gold \/ Blue AR \/ Solid","offer_id":43323074314330,"sku":"RO37-C-V2-GLD-SC-BA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Gold \/ Blue AR \/ Exhibition","offer_id":43323074347098,"sku":"RO37-C-V2-GLD-EC-BA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Gold \/ Clear AR \/ Solid","offer_id":43323074379866,"sku":"RO37-C-V2-GLD-SC-CA","price":149.0,"currency_code":"USD","in_stock":true},{"title":"Gold \/ Clear AR \/ Exhibition","offer_id":43323074412634,"sku":"RO37-C-V2-GLD-EC-CA","price":149.0,"currency_code":"USD","in_stock":true},{"title":"Black PVD \/ Blue AR \/ Solid","offer_id":43323074445402,"sku":"RO37-C-V2-BLK-SC-BA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Black PVD \/ Blue AR \/ Exhibition","offer_id":43323074478170,"sku":"RO37-C-V2-BLK-EC-BA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Black PVD \/ Clear AR \/ Solid","offer_id":43323074510938,"sku":"RO37-C-V2-BLK-SC-CA","price":149.0,"currency_code":"USD","in_stock":false},{"title":"Black PVD \/ Clear AR \/ Exhibition","offer_id":43323074543706,"sku":"RO37-C-V2-BLK-EC-CA","price":149.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0601\/2151\/4074\/files\/nomods-blue-ar-exhibition-v2-ultrathin-silver-royal-oak-seiko-mod-case-37mm-nh35-nh72-1217137825.jpg?v=1768664409"},{"product_id":"seikonaut-40mm-case","title":"Seikonaut 40mm Case — Ultra-Thin Nautilus-Style Seiko Mod Case","description":"\u003cp\u003eThe Seikonaut 40mm is one of the thinnest Nautilus-style Seiko mod cases available — just 9.95 mm at the solid caseback. CNC-machined from 316L stainless steel with brushed and polished surface finishing, this 40 mm case features an integrated-lug silhouette inspired by the iconic Nautilus shape, available in six finishes (Silver, Black, Gold, Rose Gold, Two-Tone Gold, Gunmetal). 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 finish guidance.\u003c\/p\u003e\n\u003ch2\u003eAvailable in 6 finishes\u003c\/h2\u003e\n\u003cp\u003eJump to: \u003ca href=\"#silver\"\u003eSilver\u003c\/a\u003e · \u003ca href=\"#black\"\u003eBlack\u003c\/a\u003e · \u003ca href=\"#gold\"\u003eGold\u003c\/a\u003e · \u003ca href=\"#rose-gold\"\u003eRose Gold\u003c\/a\u003e · \u003ca href=\"#two-tone-gold\"\u003eTwo-Tone Gold\u003c\/a\u003e · \u003ca href=\"#gunmetal\"\u003eGunmetal\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch3 id=\"silver\"\u003eSilver — brushed stainless with polished accents\u003c\/h3\u003e\n\u003cp\u003eThe cleanest, most versatile finish. Brushed 316L surfaces with polished bevel transitions catch light without showing wear. The all-purpose choice that pairs with any dial and any strap.\u003c\/p\u003e\n\n\u003ch3 id=\"black\"\u003eBlack — full PVD-coated stealth finish\u003c\/h3\u003e\n\u003cp\u003eA full physical-vapor-deposition coating across the case body, bracelet, and caseback. The matte tonality reads dressy-stealth in daylight and disappears entirely in low light. Pairs strongly with skeleton dials and dark-toned hands.\u003c\/p\u003e\n\n\u003ch3 id=\"gold\"\u003eGold — warm yellow champagne tone\u003c\/h3\u003e\n\u003cp\u003eYellow-gold PVD with a champagne warmth in the brushed surfaces. The dressiest of the warm-tone finishes; pairs traditionally with cream or champagne dials and brown leather, more boldly with deep blue or black-skeleton dials.\u003c\/p\u003e\n\n\u003ch3 id=\"rose-gold\"\u003eRose Gold — soft pink-gold dress tone\u003c\/h3\u003e\n\u003cp\u003ePink-gold PVD applied at lower colour-saturation than the yellow variant — reads warm and understated, the dressiest of the six finishes. Pairs especially well with white, ivory, or chocolate dials.\u003c\/p\u003e\n\n\u003ch3 id=\"two-tone-gold\"\u003eTwo-Tone Gold — brushed steel with polished gold accents\u003c\/h3\u003e\n\u003cp\u003eA duo finish — brushed silver case body with polished gold bezel, crown, and centre bracelet links. Bridges the silver and gold options for builds that don't commit to one tone. Often called a champagne or bi-colour configuration.\u003c\/p\u003e\n\n\u003ch3 id=\"gunmetal\"\u003eGunmetal — deep cool-grey with smoky finish\u003c\/h3\u003e\n\u003cp\u003eA cooler tonal cousin of black PVD — deeper than steel, lighter than full black, with a faint warm-grey undertone. The most unusual finish; pairs distinctively with brushed-steel dials or earth-toned leather.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e40 mm (10H–4H) — 38 mm (12H–6H)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e9.95 mm (solid caseback) \/ 10.3 mm (exhibition caseback)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e316L Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eBrushed with polished accents\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrystal\u003c\/td\u003e\n\u003ctd\u003eSapphire (clear or blue AR coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Resistance\u003c\/td\u003e\n\u003ctd\u003e50 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDial Fit\u003c\/td\u003e\n\u003ctd\u003e30.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrown\u003c\/td\u003e\n\u003ctd\u003eScrew-down, included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eMovements:\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDials:\u003c\/strong\u003e 30.8 mm dials only. This case does not accept 28.5 mm dials without a spacer ring. Pair it with our \u003ca href=\"\/en-de\/products\/nautilus-skeleton-dial-30-8mm\"\u003eNautilus Skeleton Dial 30.8mm\u003c\/a\u003e for a skeleton build, or any other 30.8 mm dial designed for the NH35-family.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBracelet:\u003c\/strong\u003e Stainless steel Seikonaut integrated bracelet included with the case. Standard spring bar attachment at the lugs, so you can swap to a rubber or leather strap if you prefer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot compatible:\u003c\/strong\u003e 7S26 and 7S36 movements use a different stem height and are not recommended for this case.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSeikonaut 40mm case body in your selected finish (316L stainless steel)\u003c\/li\u003e\n\u003cli\u003eSapphire crystal in your selected AR coating (clear or blue)\u003c\/li\u003e\n\u003cli\u003eCaseback in your selected configuration (solid or exhibition)\u003c\/li\u003e\n\u003cli\u003eScrew-down crown\u003c\/li\u003e\n\u003cli\u003eStainless steel Seikonaut integrated bracelet\u003c\/li\u003e\n\u003cli\u003eGaskets (pre-installed)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eTools are not included. You will need a case opener, hand press, stem cutter, and movement holder for assembly.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eDesigned by Nomods\u003c\/h2\u003e\n\u003cp\u003eThe Seikonaut is our take on the ultra-thin Nautilus-style case for Seiko mods. The 9.95 mm solid-caseback profile is the thinnest configuration we make, designed for builders who want the Nautilus integrated-lug silhouette in a dress-watch profile. The exhibition caseback adds 0.35 mm for skeleton builds where you want the movement visible. Every case is individually checked for brushing consistency, edge sharpness, and crystal seating before shipping.\u003c\/p\u003e\n\u003ch2\u003eComplete Your Build\u003c\/h2\u003e\n\u003cp\u003ePair the Seikonaut 40mm case with these compatible components:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-de\/products\/nh35-movement\"\u003eNH35 Movement\u003c\/a\u003e — the standard automatic movement for this case\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-de\/products\/nh72-skeleton-movement\"\u003eNH72 Skeleton Movement\u003c\/a\u003e — for skeleton builds with the exhibition caseback\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/en-de\/products\/royal-oak-hands-v2-silver\"\u003eSilver V2 Hands\u003c\/a\u003e — Nautilus-compatible hands in brushed silver\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBrowse Collection\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/en-de\/collections\/nautilus-style-parts\"\u003eNautilus Style Mod Parts\u003c\/a\u003e — \u003ca href=\"\/en-de\/collections\/seiko-mod-cases\"\u003eAll Seiko Mod Cases\u003c\/a\u003e — \u003ca href=\"\/en-de\/collections\/seiko-nautilus\"\u003eAll Seiko Nautilus Mods\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNomods is an independent brand specializing in Seiko-compatible watch modifications. We are not affiliated with, endorsed by, or connected to Seiko, Rolex, Audemars Piguet, Patek Philippe, or any other watch brand mentioned on this site. All brand names and trademarks are the property of their respective owners and are used solely for descriptive and comparative purposes.\u003c\/em\u003e\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"@id\": \"https:\/\/nomods.co\/products\/seikonaut-40mm-case#product\",\n  \"name\": \"Seikonaut 40mm Case — Ultra-Thin Nautilus-Style Seiko Mod Case\",\n  \"description\": \"Ultra-thin 9.95mm Nautilus-style Seiko mod case in six finishes (Silver, Black, Gold, Rose Gold, Two-Tone Gold, Gunmetal). CNC-machined 316L stainless steel, sapphire crystal with clear or blue AR coating, screw-down crown, 50m water resistance. 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