Stainless steel case with a black rubber strap. 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. Fortis calibre ETA7750 automatic movement with a 44-hour power reserve. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Case size: 44 mm. Case thickness: 15 mm. Round case shape. Band width: 20 mm. Fold over clasp. Water resistant at 200 meters / 660 feet. Functions: chronograph, day, date, hour, minute, second. Sport watch style. Watch label: Swiss Made. Item Variations: 638 10 11 K, 638-10-11 K, 638/10/11 K, 6381011 K. Fortis Cosmonauts Chronograph Black Dial Mens Watch 638.10.11 K.