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Reference: 177200. MODEL CASE: Oyster, 31 mm, Oystersteel. OYSTER ARCHITECTURE: Monobloc middle case, screw-down case back and winding crown. DIAMETER: 31 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: 2231, Manufacture Rolex. PRECISION: -2/+2 sec/day, after casing. FUNCTIONS: Centre hour, minute and seconds hands. Stop-seconds for precise time setting. OSCILLATOR WINDING: Bidirectional self-winding via Perpetual rotor. POWER RESERVE: Approximately 48 hours. BRACELET: Oyster, flat three-piece links. BRACELET MATERIAL: Oystersteel. CLASP: Oysterclasp. DIAL: Dark grey.
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