OMEGA Ref. 145012-67 SP Movement No. 26076372 Steel wrist chronograph Round case, screw-down back, tachymeter bezel, signed Black dial, 3 counters for hours, minutes and seconds, patinated indexes, minute track, 1/5th of a second graduation, signed Mechanical movement, movement protection capsule, cal. 321, signed Diameter 41 mm Additional tachymeter graduation bezel The history of the Speedmaster goes back to 1957, when it was introduced as a sports and racing chronograph, completing Omega's position as Official Timekeeper of the Olympic Games. But it has gone down in history as the watch that was on the wrist of the first man on the moon in 1969, which explains the name "Pre Moon Speedmaster" if it was made before 1969, like our example above.