Concord C1 Chronograph Watch Model no.               : 01.6.51.1084 The Omega Speedmaster Professional Chronograph was the first watch on the Moon, worn by Buzz Aldrin. Although Apollo 11 commander Neil Armstrong was first to set foot on the moon, he left his 105.012 Speedmaster inside the Lunar Module as a backup because the LM's electronic timer had malfunctioned. Aldrin elected to wear his and so his Speedmaster became the first watch to be worn on the moon.