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, 24h counter Stainless steel AISI 316L case Case diameter: 42 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 Dial: three-layer beige dial with visible ruby. Indexes and numbers treated with black superluminova, light metal spheres, beige painted, with black superluminova WATER RESISTANCE: 100 M, 10 ATM Strap: lasered and aged with natural process leather and in brown colour. Handmade in Tuscany by expert craftsmen, with a careful selection of leathers and materials and an entirely Italian manufacturing. Seams in waxed cotton. Shiny steel tongue buckle. Strap width: 20/18 mm