MOVEMENT: automatic chronograph movement, personalised to U-BOAT specifications, with date display and stem position at 9 o’clock. Personalised rhodium-plated silver 925 rotor with three-bridge construction and fixed with blue screws. Frequency: 28,800 vibrations per hour, 4 Hz. Power reserve: 48 hours. 25 jewels.   FUNCTIONS: hours, minutes, seconds, chronograph, 24h indicator, date.   CASE: 46 mm AISI 316L steel case. Polished tungsten top ring. Distinctive crown on left side with patented protection device. The bezel and case back are locked together by external tubing and a customised key that ensures total waterproofing. Oversized crown cap for easy handling, secured to the carrure in a protected position at 9 o’clock. Heat-treated steel winding crown. Chrono pushers secured to the carrure by screws (pusher at 10 o’clock with milled finish). A small window on the side reveals the movement inside.   DIAL: skeleton dial on four superimposed levels with the last layer made of laser cut fine stainless steel wire mesh, partially revealing the movement.   HANDS: laser cut hour and minute hands, hand brushed on the surface, hand painted central joint. Hands treated with white superluminova. 24h indicator with red hand.   CRYSTAL: sapphire glass curved on the face, anti reflective treatment and flat crystal on the back of the timepiece, double gasket sealing.   WATER RESISTANCE: 100 mt, 10 ATM.   STRAP: hand made and hand finished alligator black leather, 3 circular cuts out, hypoallergenic and color retain treatment. Stainless steel tongue buckle. Width: 20/20 mm.