Stainless steel case with a black leather strap. Fixed stainless steel bezel with a black ion-plated top ring showing tachymeter markings. Black dial with silver-tone hands and index hour markers. Minute markers around the outer rim. Dial Type: Analog. Chronograph - three sub-dials displaying: 60 second, 30 minute and 12 hour. Hand wind movement with a 48-hour power reserve. Scratch resistant hesalite crystal. Pull / push crown. Solid case back. Case diameter: 42 mm. Round case shape. Band width: 24.1 mm. Band length: 9 inches. Deployment clasp. Water resistant at 50 meters / 165 feet. Functions: chronograph, tachymeter, hour, minute, second. Additional Info: comes with a moonwatch presentation box which contains a "NATO" strap, velcro strap, a tool to change the bracelet and a book on the speedmaster. Dress watch style. Watch label: Swiss Made. Item Variations: 311 33 42 30 01 001, 311-33-42-30-01-001, 311/33/42/30/01/001, 31133423001001. Omega Speedmaster Chronograph Black Dial Black Leather Mens Watch 3188.8.131.52.01.001.