This 24-hour watch is inspired by a soviet model designed for use by Soviet submarine crews. Its 24-hour dial, protected by a sapphire glass, enables submariners to distinguish between night and day deep under the sea. The luminous paint on the hands and figures enables the wearer to read the time in the darkness of a submarine, and the watch is water-resistant to a level of 20 ATM (equivalent to the pressure under 200 metres of water).