Petrichor 37mm Case – Silver

The 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.

Specifications

Compatibility

Movements: NH35 and NH36. The Petrichor is designed exclusively 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.

Dials: 28.5 mm. Compatible with Royal Oak style dials, waffle dials, and other 28.5 mm dials designed for NH35-based builds.

Hands: Any NH-series compatible hands (hour 1.50 mm, minute 0.88 mm, seconds 0.20 mm).

What’s Included

• Petrichor case body (316L stainless steel, brushed silver 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

The 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.

Build Guide

Difficulty: Easy to Moderate — the Petrichor is a straightforward drop-in case for NH35 builds.

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

Common mistakes to avoid:

• Stem cutting: Measure twice before cutting. The stem length must match the Petrichor’s crown tube depth exactly. A stem that is too long prevents the crown from screwing down; too short and the crown will not engage the movement.
• Crystal gasket seating: The domed sapphire comes pre-installed, but ensure the gasket sits evenly if you ever need to reseat it.
• Dial alignment: Seat the dial feet firmly in the movement’s dial slots before lowering the movement into the case.

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

Frequently Asked Questions

Complete Your Build

Pair the Silver Petrichor case with these compatible components:

• NH35 Movement — the recommended automatic movement for this case
• Silver Royal Oak 28.5mm Dial — matches the brushed silver case finish
• Silver-White Waffle Dial (28.5mm) — textured dial with a light, clean look
• Silver V2 Hands — brushed silver hands to match the case

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Petrichor 37mm Seiko Mod Parts · All Seiko Mod Cases · Petrichor Watch Modding Case · Seiko Mod Petrichor 37mm

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.