This 34.5x41.5mm. TISSOT SEASTAR chronograph is a fine quality and underrated vintage watch, being that is was produced by OMEGA. and utilizes the famed and fine caliber 861 Omega Speedmaster moon watch movement. In this watch, the movement is named the Lemania 1873. The chronograph is working perfectly and keeping accurate time after a recent meticulous cleaning. The steel case with screw back looks excellent and retains the correct TISSOT winding crown. The vibrant dial and hands are all original. This chrono is great value at only $1595.