Model case Oyster, 41 mm, Oystersteel Oyster architecture Monobloc middle case, screw-down case back and winding crown Diameter 41 mm Material Oystersteel Bezel Domed Winding crown Screw-down, Twinlock double waterproofness system Crystal Scratch-resistant sapphire Water resistance Waterproof to 100 metres / 330 feet Movement Perpetual, mechanical, self-winding Calibre 3230, Manufacture Rolex Precision -2/+2 sec/day, after casing Functions Centre hour, minute and seconds hands. Stop-seconds for precise 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 Oyster, three-piece solid links Material Oystersteel Clasp Folding Oysterclasp with Easylink 5 mm comfort extension link Dial Pistachio Details Highly legible Chromalight display with long-lasting blue luminescence