Rolex 126660 dbl Oyster Perpetual Sea-Dweller Watch. 44mm oystersteel case with helium escape valve, screw-down back, screw-down crown, unidirectional rotating bezel with scratch-resistant ceramic Cerachrom insert and platinum coated 60-minute graduations and numerals, domed 5.5mm thick scratch-resistant crystal, d-blue dial with gradient from deep-blue to black, Rolex calibre 3235 perpetual self-winding movement, approximately 70 hours of power reserve, Oyster bracelet with flat three-piece links, folding Oysterlock safety buckle with Rolex glidelock extension system and fliplock extension link. Waterproof to 3,900 meters (12,800 feet).