Omega Seamaster Diver 300M Co-Axial Master Chronometer Chronograph (18.104.22.168.01.001). Caliber 9900automatic movement with Co-Axial escapement, certified Master Chronometer and 60 hours power reserve. Central hour, minute and chronograph seconds hands, small seconds hand, 12-hour counter at 3 o’clock position, 60-minutes counter at 9 o’clock position.Date window at the 6 o’clock position. Black ceramic dial with index hour markers. Black ceramic unidirectional rotating bezel set on a 44mm stainless steel case. Sapphire crystal top and exhibition case back. Helium-escape valve at 10 o’clock position. Water resistant to 300m. Rubber strap.