Black Seamaster 300 Case 41mm Sapphire for NH35/NH36 10ATM

Build a stealthy Seamaster 300-style diver with this 41mm black watch case. Crafted from 316L stainless steel with a black finish, it features a sapphire crystal and 10ATM water resistance. The 41mm case, 14.5mm thickness, 20mm lug width, and 48.5mm lug-to-lug length provide a bold yet balanced wrist presence. It fits 31mm–31.8mm dials and is compatible with NH35 and NH36 automatic movements. The case is completed with a 120-click unidirectional bezel that accepts a 38mm × 30.6mm bezel insert. A rugged foundation for custom dive watch builds.

Full Spec List:

• Product: Seamaster 300 Style Watch Case

• Case Material: 316L stainless steel (black finish)

• Case Diameter: 41mm

• Case Thickness: 14.5mm

• Lug Width: 20mm

• Lug to Lug: 48.5mm

• Dial Fit: 31mm – 31.8mm

• Glass: Sapphire crystal

• Bezel: 120-click unidirectional rotating bezel

• Bezel Insert Size: 38mm × 30.6mm

• Water Resistance: 10ATM (100 meters)

• Compatible Movements: NH35 / NH36

• Style: Seamaster 300-inspired diver

• Application: Custom builds, modding, dive watches