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. Buzz Aldrin elected to wear his and so his Speedmaster became the first watch to be worn on the moon. Armstrong's watch is now displayed at the National Air and Space Museum in Washington, D.C.
In 2007, to mark the 50th anniversary of the Omega Speedmaster Professional Chronograph, the Omega company unveiled the commemorative Speedmaster Professional Chronograph Moonwatch. The watch had the distinctive features of the first hand-winding Omega Speedmaster introduced in 1957. It was sold in an edition of 5,957.