Rolex Datejust 31 278240-0017 ...

Rolex Datejust 31 278240-0017 Oyster, 31 mm, Oystersteel Blue Dial Oyster Bracelet Specifications: Brand: Rolex Model:  Datejust 36 Reference Number: 278240-0017 CASE Model Case Oyster, 31 mm, Oystersteel Oyster Architecture Monobloc middle case, screw-down case back and winding crown Case Diameter 31 mm Case Material Oystersteel Crystal Scratch-resistant sapphire, Cyclops lens over the date Bezel Domed Winding Crown Screw-down, Twinlock double waterproofness system Water Resistance Waterproof to 100 metres / 330 feet DIAL Dial Color Bright blue BRACELET Material Oystersteel Band Name Oyster, three-piece solid links Clasp Folding Oysterclasp with Easylink 5 mm comfort extension link MOVEMENT Movement Perpetual, mechanical, self-winding Calibre 2236, Manufacture Rolex Precision -2/ 2 sec/day, after casing Functions Centre hour, minute and seconds hands. Instantaneous date with rapid setting. Stop-seconds for precise time setting Oscillator Syloxi hairspring in silicon with patented geometry. High-performance Paraflex shock absorbers Winding Bidirectional self-winding via Perpetual rotor Power Reserve Approximately 55 hours Certification Superlative Chronometer (COSC Rolex certification after casing)