39mm Dive Watch Case BB58 Mod 20BAR Waterproof Dome Sapphire Glass 39mm Black Bay Watch Case for NH34 NH35 NH36 NH70 ETA2824 PT5000 Watch Parts

This 39mm dive watch case is a classic BB58 mod design, built for professional watch modding and custom builds. Made from solid 316L stainless steel with black or rose gold coating, it features a domed sapphire crystal, 20BAR (200m) water resistance, and broad movement compatibility. Ideal for NH and ETA-based automatic movements, this case offers durability, vintage proportions, and a premium diver aesthetic. Custom logo service is supported.

Specifications:

• Case Material: Solid 316L stainless steel, black / rose gold coated

• Case Size: 39mm diameter × 12.5mm thickness (≈14mm with sapphire)

• Dial Fit: 28.5mm–29.3mm

• Strap Width: 20mm

• Glass: Domed sapphire crystal

• Water Resistance: 20BAR / 200m

• Bezel: Unidirectional, alloy insert

• Bezel Size: 37.1mm × 31.3mm

• Case Back: Solid back / glass back optional

• Movement Fit:
  NH34 / NH35A / NH36A / NH38 / NH39 / NH70 / NH72
  ETA 2824 / PT5000 / ST2130

Service:

• Custom Logo: Case customization supported (extra fee)