Stainless steel case with a stainless steel Rolex oyster bracelet. Fixed domed stainless steel bezel. Black dial with silver-tone hands and Roman numeral hour markers. Dial Type: Analog. Date display at the 3 o'clock position. Rolex calibre 2235 automatic movement with a 48-hour power reserve. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Case size: 31 mm. Round case shape. Oysterlock clasp. Water resistant at 100 meters / 330 feet. Functions: date, hour, minute, second. Luxury watch style. Watch label: Swiss Made. Item Variations: 178240, 178240-BKRO, Rolex-178240, Rolex-178240-BKRO. Rolex Datejust Lady 31 Black Dial Stainless Steel Rolex Oyster Automatic Watch 178240BKRO.