Stainless steel case with a stainless steel bracelet. Fixed stainless steel bezel showing tachymeter markings. Black dial with luminous silver-tone hands and index hour markers. Minute markers around the outer rim. Dial Type: Analog. Luminescent hands and markers. Date display at the 6 o'clock position. Chronograph - two sub-dials displaying: seconds and 30 minute. Omega calibre 9300 automatic movement with a 60-hour power reserve. Scratch resistant sapphire crystal. Pull / push crown. Transparent case back. Round case shape. Case size: 41.5 mm. Case thickness: 16.5 mm. Band width: 20 mm. Deployment clasp. Water resistant at 100 meters / 330 feet. Functions: chronograph, date, hour, minute, second, chronometer, tachymeter. Luxury watch style. Watch label: Swiss Made. Item Variations: 331 10 42 51 01 001, 331-10-42-51-01-001, 331/10/42/51/01/001, 33110425101001. Omega Speedmaster Chronograph Black Dial Steel Mens Watch 33110425101001.