Swiss made automatic mechanical movement, modified and personalised at U-BOAT specifications Frequency: 28.800 vibrations per hour, 4 Hz Jewels: 26 Power reserve: 38 hours Functions: date, hours, minutes, seconds Stainless steel AISI 316L case with DLC black treatment Case diameter: 46 mm Screw-down crown, positioned underneath the massive crown cap (protected as a Trade Mark), and automatic and helium escape valve High quality sapphire crystal WATER RESISTANCE: 300 M, 30 ATM Ultra-resistant vulcanised rubber strap, in black color, personalised with the logo Tongue buckle, width 22/20 mm