41mm Mod Turtle Watch Case Sapphire Glass Waterproof For Abalone/tuna mouth Captain Willard TMI NH35 NH36 NH38 4R Movement Stainless Steel Watch Accessories
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Small Turtle modification (mod) watch case designed for building custom diver-style watches, inspired by Seiko's classic "Turtle" (SRP series, also called Abalone) and "Tuna" (shrouded diver) designs. These cases are popular in the watch modding community for upgrading or building homage watches using affordable Seiko NH35/NH36 automatic movements.
Key Specifications
- Material: 316L stainless steel (durable, corrosion-resistant)
- Case Diameter: 41mm (modern wearable size)
- Thickness: 12.7mm
- Crown Position: Offset at approximately 3.8 o'clock (common in Turtle-style cases for comfort)
- Bezel: Fits outer diameter 38mm, inner 31.5mm (likely a rotating diver bezel)
- Dial Fit: 28.5mm diameter (standard for NH35 movements)
- Movement Compatibility: NH35, NH36, NH34, NH38, and similar (e.g., 4R36)
- Crystal: Sapphire glass (scratch-resistant, high clarity)
- Water Resistance: 100 meters (10ATM) with screw-down crown
- Case Back: Solid stainless steel (screw-in for waterproofing)
- Lug Width: 19mm (for straps/bands)


























































































































































































