Royal Oak 41mm Case – Silver

The Silver Royal Oak 41mm is the largest integrated-design case in the Nomods lineup — bold wrist presence without the price tag of a full build. CNC-machined from 316L stainless steel with an octagonal bezel, polished rehaut, and brushed mid-case, this case captures the finishing language of luxury integrated-bracelet sports watches. The 41 mm diameter sits confidently on wrists 17 cm and above. Sapphire crystal in your choice of Blue AR, Clear AR, or No AR coating, screw-down crown, and 100 m water resistance when assembled correctly. Compatible with NH35, NH38, NH70, NH71, and NH72 movements. Includes a spacer ring for 30.8 mm dials.

Specifications

Compatibility

Movements: NH35, NH38, NH70, NH71, NH72 — all drop in without modification. This covers standard three-hand, skeleton, and GMT configurations from the Seiko NH family.

Dials: 30.8 mm dials fit with the included spacer ring. 31.8 mm dials fit directly without the spacer. Most Royal Oak style dials in the Nomods catalog are 30.8 mm and designed for this case.

Hands: We recommend a longer handset for the 41 mm dial opening — standard-length hands designed for smaller cases may look undersized. Check the recommended parts for this case for tested hand options.

Straps: 22 mm lug width. Compatible with Royal Oak 41mm rubber straps and any standard 22 mm strap or NATO.

What’s Included

• Case body (316L stainless steel, brushed silver finish)
• Sapphire crystal (pre-installed, variant-dependent AR coating)
• Spacer ring (for 30.8 mm dials)
• Screw-down crown
• Caseback gasket and crystal gasket
• Spring bars

Movement, dial, hands, strap, and tools are not included.

Why We Chose This Case

The Royal Oak 41mm is the most popular integrated-style case in the Seiko modding community for good reason. The octagonal bezel geometry is sharp and precise, with alternating brushed and polished surfaces that create real depth under changing light. The polished rehaut adds a ring of brightness between the dial and bezel that most aftermarket cases at this price skip entirely. We tested dimensional accuracy across production batches and confirmed that crown alignment, crystal seating, and gasket fit are consistent. At $110, this is the most affordable entry into a 41 mm Royal Oak build with sapphire crystal and 100 m water resistance.

Build Guide

Difficulty: Moderate — stem cutting and gasket seating are the two steps that require care.

Tools needed: Case opener (or caseback press), hand press or hand setter, stem cutter, movement holder, rodico, and tweezers.

Key steps:

1. Set the movement into the case with the spacer ring (if using a 30.8 mm dial)
2. Cut the crown stem to length — measure before cutting, as the 41 mm case requires a specific stem length. Cut too short and the crown won’t engage; too long and it won’t screw down.
3. Press the hands onto the movement — use a longer handset for proper proportions on the 41 mm dial opening.
4. Seat the caseback with gasket and tighten evenly.

Read the full step-by-step instructions in our Seiko mod build guide.

Frequently Asked Questions

Complete Your Build

Pair this silver case with matching silver-tone components:

• Dials: 30.8 mm Skeleton Dial (Silver Index) · 30.8 mm Skeleton Dial (Gold Index)
• Hands: Royal Oak Silver Hands
• Straps: Black Rubber Strap · Blue Rubber Strap
• Movements: NH35 · NH70

Browse the full Royal Oak 41mm Case collection · Recommended parts for this case · 41mm Seiko Mod Parts · All Seiko Mod Cases

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