Omega Speedmaster Moonphase Co-Axial Chronograph Watch (304.23.44.52.06.001). Caliber 9904 Automatic Co-Axial Master Chronometer chronograph movement. Central chronograph hand, 12 hour counter at 3 o`clock position, Moonphase indicator at 6 o`clock position, seconds and date indicator at 9 o`clock position. Grey dial and index hour marker. Green CERAGOLD bezel stamped with tachymeter scale set on a 44.25 stainless steel and yellow gold case . Sapphire crystal and exhibition case back. Water resistant to 100M. Gray leather strap and steel folding buckle.