Seikonaut / Nautilus Style Seiko Modding Case Ultrathin Silver
- 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.
The Thinnest Seiko Modding Case in Silver
This silver Seikonaut case has been engineered with one clear goal: to become the thinnest Seiko mod case in the world. At just 9.95mm with a closed caseback and 10.3mm with an open caseback, it offers proportions rarely seen in the Seiko modding community, especially for builds based on the Seiko Nautilus mod style.
Designed for Multiple Seiko Movements
This case has been designed for full compatibility with Seiko NH35, NH36, NH38, NH70, NH71, and NH72 movements. Combined with its fit for a 30.8mm dial, it provides flexibility across different Seiko modding projects, from skeleton builds to open-heart dials.
Correct Nautilus Dimensions
The Seikonaut format requires precise measurements to look balanced. This silver case measures 40mm across from 10H to 4H and 38mm from 12H to 6H. The proportions make it wearable on a wide range of wrists while staying true to the iconic Nautilus design language that inspires so many Seiko modders.
Premium Materials and Finish
This case is crafted from solid 316L stainless steel with a finely executed brushed and polished finish. Unlike plated alternatives, the natural steel construction ensures lasting durability and a surface that can be refinished over time—making it one of the most reliable foundations for any Seiko modding project.
Sapphire Crystal and Options
The front crystal is sapphire and can be ordered with either clear anti-reflective coating or blue AR depending on the desired aesthetic. The case is rated to 50M water resistance, giving your Seiko mod practicality alongside its refined proportions.
A Foundation for the Best Seiko Mods
A case defines the character of any watch build. For Seiko modding enthusiasts pursuing the best Seiko Nautilus mods, this silver Seikonaut case offers a blend of thin engineering, premium materials, and precise fitment that elevates it above typical Seiko mod parts.
