Stainless steel case with a stainless steel bracelet. Uni-directional rotating stainless steel bezel with a black top ring. Black dial with luminous hands and Arabic numeral hour markers. Minute markers. Tachymeter markings around the outer rim. Dial Type: Analog. Luminescent hands and markers. Day of the week and date display at the 3 o'clock position. Chronograph - three sub-dials displaying: 60 second, 30 minute and 12 hour. ETA 7750 Valjoux automatic movement with a 44-hour power reserve. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Case size: 42 mm. Case thickness: 15.5 mm. Round case shape. Band width: 20 mm. Band length: 8 inches. Deployment clasp. Water resistant at 200 meters / 660 feet. Functions: Chronograph, Tachymeter, Day, Date, Hour, Minute, Second. Luxury watch style. Watch label: Swiss Made. Item Variations: 638 10 11 M, 638-10-11 M, 638/10/11 M, 6381011 M. Fortis B-42 Cosmonaut Chronograph Black Dial Mens Watch 6381011M.