Description: ROLEX Model case Oystersteel, 40 mm, President Oyster architecture Monobloc middle case, screw-down case back and winding crown Bezel Fluted Winding crown Screw-down, Twinlock double waterproofness system Crystal Scratch-resistant sapphire, Cyclops lens over the date Water resistance Waterproof to 100 metres / 330 feet Movement Perpetual, mechanical, self-winding Functions Centre hour, minute and seconds hands. Instantaneous day and date in apertures, secure rapid-setting. Stop-seconds for exact time setting Oscillator Paramagnetic blue Parachrom hairspring. High-performance Paraflex shock absorbers Winding Bidirectional self-winding via Perpetual rotor Power reserve Approximately 70 hours Bracelet President stainless steel, semi-circular three-piece links Clasp Concealed folding Crownclasp Dial Bright blue