MOVEMENT: automatic chronograph movement, personalised to U-BOAT specifications with decorations, date display and stem position at 9 o’clock. Personalised 925 silver rotor consisting of a base and three bridges 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: naturally aged bronze, 46 mm diameter. The bezel and case back are locked together by external tubing and a customised key that ensures total waterproofing. Distinguishing crown on left side, with a patented protective device.   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. Bronze color, hand-brushed counter hands and seconds. Red color 24h indicator hand.   CRYSTAL: curved fumé sapphire on the face with anti reflective treatment and flat sapphire on the back of the timepiece, double gasket seal.   WATER RESISTANCE: 100 mt, 10 ATM.   STRAP: handmade from hand-finished calf leather, carefully selected and processed according to the traditional artisanal techniques used in the 1800s, giving the strap a naturally distressed look and feel, fleur-de-lis decoration in bronze. Naturally aged bronze tongue buckle. Width: 20/22 mm.