The 40mm King, the Rolex Air-King. Silver-tone stainless steel case with a silver-tone stainless steel bracelet. Fixed silver-tone stainless steel bezel. Black dial with luminous silver-tone Mercedes-logo, sword, and Breguet-style shape hands and Arabic numeral hour markers. Minute markers around the outer rim. Dial Type: Analog. Rolex Calibre 3131 automatic movement with a 48-hour power reserve. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Round case shape. Case size: 40 mm. Oysterlock clasp. Water resistant at 100 meters / 330 feet. Functions: hour, minute, second, chronometer. Luxury watch style. Watch label: Swiss Made. Rolex Air King Black Dial Stainless Steel Mens Watch 116900BKAO. COSC Swiss Made Certification.