Omega Mens Watch 2910.50.91 - Olympians Michael Phelps & Ian Thorpe Advertised Model - Black Dial - Black Bezel - Self Winding Automatic Chronometer Co-Axial Movement - Chronograph Feature - Caliber: Omega 3313, Power Reserve: 55 Hours - Unidirectional Rotating Bezel - Certificate of Authenticity - Scratch Resistant Sapphire Crystal - Steel Case on Black Rubber Strap - Manufacturer Box & Manual - 600 Meters / 2000 Feet Water Resistant - Luminescent Hands and Markers - 45mm = 1 3/4" Case, 7" Adjustable Strap - Screw Down Crown & Caseback - Tang Buckle