Speedmaster Reduced 3510.50

Officially the Speedmaster AutomaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist.: a smaller (39 mm listed, about 38.5 mm measured, 45 mm lug to lug), self-windingAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist. chronographChronographA watch function for starting, stopping and resetting an elapsed-time measurement independently of the ordinary time display. styled on the Moonwatch. Not a Moonwatch.