U-Boat U-51 Limited Edition D UB-090

U-51 Limited Edition 100 Pieces Worldwide. MOVEMENT : Arola-Alfred Rochat Lap Timer Chronograph derived from the Valjoux with a 30 mm. diameter, 8.10 mm thickness, 25 rubies. Soigné finishing, 4-position adjusted, 28.800 alternations. per hour. Power reserve 40-44 hours. CASE: AISI 316 plus stainless steel. 51mm diameter (59.60 mm diameter including external crown-clutter). The bezel and the back of the case are locked together by external tubing and a customized key that ensures absolute water-proofing. Thickness: 19.60 mm. Weight: 200 g approx. CRYSTAL: sapphire glass on the face and at the back of the timepiece, both thick and flat with a double compression gasket fitted. WATER RESISTANCE: 120 m, 12 ATM. DIAL: dial with increased strength, hour and minute indexes treated with superluminova. STRAP: in rubber with alligator inset, horn back, dark brown and steel tongue buckle, hand-made and hand-finished.