Rolex Oyster Perpetual Datejust 31mm | 278271-0030MODEL CASE Oyster, 31 mm, Oystersteel and Everose gold. OYSTER ARCHITECTURE Monobloc middle case, screw down case back and winding crown. DIAMETER 31 mm. MATERIAL Everose Rolesor combination of Oystersteel and Everose gold. 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
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