Omega Planet Ocean 600 M Omega Co-axial Master Chronometer Chronograph Watch - 45.5 mm Steel Case - Unidirectional Blue Ceramic Bezel - Blue Ceramic Dial - Blue Leather Strap - 215.33.46.51.03.00145. 5 mm stainless steel case with anti magnetic properties and helium escape valve, transparent back, screw in crown, unidirectional rotating blue ceramic bezel with Liquidmetal diving scale, scratch resistant sapphire crystal, blue ceramic dial with Arabic numerals and a date window at the 6 oclock position, small seconds sub dial, as well as 60 minute and 12 hour counters on one dial, caliber Omega 9900 self winding Co Axial master chronometer