Case 50 mm, Titanium. GMT timepiece, features a rotating bezel and a special additional red hand which indicates a third time zone. MOVEMENT: automatic mechanical personalized to U-BOAT specifications for date display and stem to be positioned at 9 o’clock. Frequency: 28,800 vibrations per hour, 4 Hz. Power reserve: 42 hours. 21 jewels. FUNCTIONS: hours, minutes, seconds, 24h, third time zone, date. CASE: 50 mm titanium case. Uni-directional rotating bezel, in titanium, lockable with a lever on the right side of the case. 12 o’clock ball indicator on the bezel made of ceramic. BACK: titanium, fastened with six steel screws. CRYSTAL: high quality sapphire glass with anti-reflective treatment. DIAL: matt black, markers treated with superluminova (beige color). Bâton hands, treated with superluminova. Red 24h and third time zone hands. WATER RESISTANCE: 300 mt, 30 ATM. STRAP: hand made and hand finished calf leather, carefully selected and processed following the traditional artisan handcrafted techniques used in the 1800’s, which give the strap a naturally distressed feel and look. Tongue buckle in titanium. Width: 23/23 mm. Strap: ref. 4876/Z Buckle: ref. 6372/M