Omega Seamaster Co-Axial Chronograph Watch (188.8.131.52.03.001).Caliber Omega 9900 automatic co-axial chronograph Master Chronometer movement. 12 hour counter at 3 o`clock position and 60 seconds counter at 9 o`clock position. Date window at 6 o`clock position. Black ceramic dial with index hour markers. Black ceramic rotating bezel engraved with Arabic numerals set on a 45.5mm stainless steel case. Sapphire crystal on top and exhibition case back. Helium-escape valve at 10 o`clock position. Water resistant to 600M. Blue leather strap with rubber lining and stainless steel bracelet.