Stainless steel case with a stainless steel rolex oyster bracelet. Fixed domed stainless steel bezel. Black dial with silver-tone hands and index hour markers. Arabic numerals mark the 3, 6 and 9 o'clock position. Minute markers around the outer rim. Dial Type: Analog. 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: hour, minute, second. Luxury watch style. Watch label: Swiss Made. Item Variations: 177200, 177200-BKSO, Rolex-177200, Rolex-177200-BKSO. Rolex Oyster Perpetual 31 mm Black Dial Stainless Steel Rolex Oyster Automatic Unisex Watch 177200BKASO.