Omega Seamaster Railmaster Automatic Chronometer Blue Dial Men's Watch 220.10.40.20.03.001.  Silver-tone stainless steel case and bracelet. Fixed silver-tone stainless steel bezel. Blue dial with silver-tone hands and index hour markers. Arabic numerals mark the 3, 6, 9 and 12 o'clock positions. Minute markers around the outer rim. Luminescent hands and markers. Omega Calibre 8806 Automatic movement, containing 35 Jewels, bitting at 25200 vph, and has a power reserve of approximately 55 hours. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Round case shape, case size: 40 mm. Band width: 20 mm. Fold over clasp with a push button release. Water resistant at 150 meters / 500 feet. Functions: hour, minute, second, co-axial escapement, chronometer, magnetic resistant. Seamaster Railmaster Series.