30 atm and 20 atm water resistance of these watches provides by the following construction features:

• Back cover assembly includes fixed case back pressed to the case body by additional ring.
• Size: Ø 48.7mm x 16mm
  Movement: SII NH35 Automatic

Such construction provides the highest possible water resistance level in any conditions of watch wearing.

• Enhanced K1 crystal of 3 mm thickness.
• Screw-in crown

The strap is fixed to the watch case by strong steel tube and two screws of the TORX standard and can be easily replaced with another strap using the included, special screwdriver.

Tolerance: Automatic Movement

Calendar: Date at 6 o'clock position

Crystal: 3.5mm thick, enhanced hardened K1 mineral

Luminosity: Gaseous Tritium Light Source (GTLS) with 15 tubes in total. 

Dial: Black, Multi-layer 

Crown: Screw-down

Bezel: Uni-directional rotating bezel

Case: Silver, 48mm diameter, 316L surgical grade stainless steel

Strap: Black, 24mm genuine leather strap attached. Comes with extra, interchangeable black silicone strap with changing tools

Water Resistance: 300 meters (984 feet)