Omega Seamaster Diver 300 M Co-Axial GMT Chronograph Watch - 44 mm Steel Case - Matt Black Ceramic Bezel - Matt Black Dial - 212.30.44.52.01.00144 mm stainless steel case, sapphire back, screw in crown, matt black ceramic bezel with unidirectional rotating, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, matt black dial with red GMT hand that matches the red 24 hour scale on the dial which makes it possible to keep track of time in a second time zone, caliber 3603 self winding movement with chronometer and 2nd time zone through 24 hour hand, 12 hour and