Seikonaut / Nautilus Style Seiko Modding Case Ultrathin Black PVD
- Sapphire Crystal
- 100M waterproof
- 316L Stainless Steel
We offer free shipping directly from the factory! This way we can ensure fast delivery at a reasonable price.
- 37mm
- 11.6mm thick (Including glass)
- Domed Sapphire Crystal
- 100M waterproof
- 316L Stainless steel
- Fits NH35, NH38, NH36, NH70, NH71, NH72 etc...
Note: This is a pre-order of the CASE ONLY. Final production may vary slightly from the current specifications. The thinnest Seiko mod case on the market is 9.96 mm. While our design targets a slimmer profile, if the final thickness is slightly higher and does not set a new record, this will not qualify for a refund.
Slim Black Seiko Modding Case
The black Seikonaut case is built for modders aiming to achieve an ultra-thin Seiko Nautilus mod in a darker, stealth finish. At 9.95mm (closed back) and 10.3mm (open back), it ranks among the slimmest Seiko mod cases available anywhere.
Movement and Dial Fitment
The case accepts a 30.8mm Seiko mod dial and is compatible with NH35, NH36, NH38, NH70, NH71, and NH72 movements. Whether you’re creating a clean time-only build, an open-heart Seiko mod, or a skeleton project, this case provides the necessary fit and balance.
Dimensions for a Nautilus Build
True to the Seikonaut format, the case measures 40mm across (10H–4H) and 38mm vertically (12H–6H). These proportions give the case its distinctive Nautilus presence while ensuring wearability on different wrist sizes.
Premium Seiko Mod Parts
Made from 316L stainless steel with a 20 micron black PVD plating, this case is far more durable than typical aftermarket Seiko modding cases. A sapphire crystal with clear or blue AR coating offers clarity and scratch resistance, while 50M water resistance ensures practicality.
Why Modders Choose It
The black finish makes it an excellent choice for stealthy Seiko Nautilus mods, skeleton builds, or bold contrast dials. For those pursuing one of their best Seiko mods, this black Seikonaut case provides the specifications needed for lasting quality.
