Petrichor 37mm Case – Gunmetal

The Gunmetal Gray Petrichor sits between the bright silver and the deep black — a darker, industrial-leaning tone that reads as serious without going fully stealth. The same 37 mm Nomods original design with vintage-inspired curves, domed sapphire crystal, and low-profile silhouette, finished in gunmetal gray PVD over 316L stainless steel. The gray tone has a subtle metallic depth that shifts in different lighting, darker indoors and more reflective in sunlight. Compatible with NH35 and NH36 movements, 28.5 mm dial opening, ready to build.

Specifications

Compatibility

Movements: NH35 and NH36. The NH72 skeleton movement also fits, sharing the same physical dimensions. The gunmetal gray provides a neutral backdrop that lets a skeleton dial’s exposed mechanics stand out without competing with a warm or bright case color.

Dials: 28.5 mm. Gunmetal gray is a neutral tone that pairs with almost any dial color. Silver and white dials create clean combinations, while blue or green dials add a single pop of color against the muted case.

Hands: Any NH-series compatible hands (hour 1.50 mm, minute 0.88 mm, seconds 0.20 mm). Silver hands offer the best legibility; darker hands blend into the case for a subdued look.

What’s Included

• Petrichor case body (316L stainless steel, gunmetal gray PVD finish)
• Domed sapphire crystal (pre-installed)
• Crown (screw-down)
• Gaskets

Tools are not included. You will need a case opener, hand press, stem cutter, and movement holder for assembly.

Designed by Nomods

Gunmetal gray is the most modern-leaning finish in the Petrichor range. Where the silver, gold, and rose gold variants lean into the case’s vintage design roots, the gunmetal gray pushes it toward a contemporary tool-watch sensibility. The PVD coating is applied via Physical Vapor Deposition for durability that matches or exceeds the other Petrichor finishes. On the Petrichor’s curved surfaces, the gray creates a unique optical effect — the tone appears to darken in concave areas and lighten on convex surfaces, giving the case a three-dimensional quality that flat-sided cases cannot reproduce. The domed sapphire crystal maintains the seamless, flowing profile. Each case is inspected for PVD uniformity and finishing consistency before shipping.

Build Guide

Difficulty: Easy to Moderate — identical assembly to all other Petrichor variants.

Tools needed: Case opener, hand press, stem cutter, movement holder.

PVD care note: Gunmetal gray PVD hides minor marks better than black PVD because the color difference between the coating and the steel beneath is less stark. However, still use soft-jaw tools and protective tape at contact points during assembly.

Common mistakes to avoid:

• Stem cutting: Measure the crown tube depth first. Cut the stem to match precisely — too long and the crown will not screw down, too short and it will not engage the movement.
• Movement orientation: Align the crown stem with the crown tube before lowering the movement into the case. Forcing the stem at an angle can bend it.
• Caseback pressure: Apply even pressure when seating the caseback. Uneven force can mark the PVD finish or pinch the gasket.

For full step-by-step instructions, read our complete Seiko mod build guide.

Frequently Asked Questions

Complete Your Build

Pair the Gunmetal Gray Petrichor case with these compatible components:

• NH35 Movement — the recommended automatic movement for this case
• Silver Royal Oak 28.5mm Dial — clean contrast that keeps the build legible against the dark case
• Blue Waffle Dial (28.5mm) — adds a single color accent against the neutral gray
• Silver V2 Hands — bright silver hands for strong readability

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