Rolex GMT Master Black Bezel Automatic Steel Mens Watch 16700. Officially certified chronometer self-winding movement. Stainless steel case 40.0 mm in diameter. Bidirectional rotating bezel with a special 24-hour black bezel insert. Scratch resistant sapphire crystal. Black dial with white luminescent hour markers and Mercedes hands. Date window at 3 o'clock aperture. Stainless steel oyster bracelet with flip lock clasp.