This Rolex 277200 Oyster Perpetual 31 Watch Tiffany , screw-down crown with twin lock double waterproofness system, domed bezel, scratch-resistant sapphire crystal, index hour markers, Rolex caliber 2232 automatic movement with center hour, minute and seconds hands, and stop-seconds for precise time setting, approximately 55 hours of power reserve, Oyster bracelet with flat three-piece links, folding Oyster clasp buckle with Easylink 5mm comfort extension link. Waterproof to 100 meters.