Rolex Oyster Perpetual Milgauss 40mm | 116400GV-0001Oyster, 40 mm, Oystersteel. Monobloc middle case. screw down case back and winding crown. Smooth bezel. Screw down crown. Twinlock double waterproofness system. Sapphire scratch resistant crystal. Waterproof to 100 metres 330 feet. Perpetual mechanical self winding movement with a magnetic shield. Caliber 3131 manufacture Rolex. 2 +2 sec day, after casing precision. Functions: Centre hour, minute and seconds hands. Stop seconds for precise time
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