Silver-tone stainless steel case with a silver-tone stainless steel oyster bracelet. Fixed silver-tone stainless steel bezel. Grey dial with Roman numeral hour markers. Dial Type: Analog. Luminescent hands and dial markers. Rolex Calibre 2231 automatic movement with a 42-hour power reserve. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Round case shape. Case size: 31 mm. Water resistant at 100 meters / 330 feet. Functions: hours/ minutes/ seconds. Luxury watch style. Watch label: Swiss Made. Rolex Oyster Perpetual 31 Automatic Grey Dial Unisex Watch 177200GYRO.