Silver-tone stainless steel case with a silver-tone stainless steel bracelet. Fixed silver-tone stainless steel with a black top ring bezel. Black dial with silver-tone hands and index hour markers. Minute markers around the outer rim. Dial Type: Analog. Luminescent hands and markers. Chronograph - sub-dials displaying: three - 60 second, 30 minute and 12 hour. Omega Calibre 1863 hand wind movement with a 48-hour power reserve. Scratch resistant sapphire crystal. Pull / push crown. Skeleton case back. Round case shape, case size: 42 mm, case thickness: 14.3 mm. Band width: 20 mm. Hidden fold over clasp. Water resistant at 50 meters / 165 feet. Functions: chronograph, hour, minute, second, tachymeter. Dress watch style. Watch label: Swiss Made. Item Variations: 311 30 42 30 01 006, 311-30-42-30-01-006, 311/30/42/30/01/006, 31130423001006. Omega Speedmaster Professional Moon Chronograph Mens Watch 311.30.42.30.01.006.