Authentic Omega Constellation Co-Axial Master Chronometer Model 131.33.41.21.03.001 (also known as model 13133412103001). Men's round stainless steel case featuring a fixed blue ceramic bezel with Roman numerals, and a blue leather strap with rubber lining equipped with a tang clasp. Silver tone hands and luminous index hour markers including minute markers around the outer rim adorn the blue dial. Powered by the Omega Calibre 8900 automatic chronometer movement possessing a 60-hour power reserve indicator. Includes date functionality, scratch-resistant sapphire crystal glass, transparent case back. Water resistant to 50 meters (165 feet). Comes with a standard 5-year WatchMaxx warranty.