Swiss made automatic movement, modified and personalised at U-BOAT specifications Frequency: 28.800 vibrations per hour, 4 Hz Jewels: 26 Power reserve: 44 hours Functions: hours, minutes, seconds, date Bronze case Case diameter: 47 mm Case back: screwed in, fumé glass showing the skeleton balance wheel Screw-down crown, positioned underneath the massive crown cap (protected as a Trade Mark), and automatic and helium escape valve High quality sapphire crystal with anti reflective treatment WATER RESISTANCE: 100 M, 10 ATM Brown calf leather Strap width: 23/22 mm The untreated bronze has a natural changing of its shades with time, this makes each watch one of a kind