Omega Speedmaster Moonwatch Caliber 321 Steel

About This Watch

The Omega Speedmaster Moonwatch Caliber 321 is a faithful recreation of the iconic Speedmaster that Buzz Aldrin wore on the surface of the Moon in 1969. Omega meticulously re-engineered the legendary caliber 321 — the original movement from the ST105.012 — by scanning Ed White's Speedmaster (serial ST105.003) worn during the first American spacewalk. The result is a movement that is virtually identical to the original, featuring the same column-wheel chronograph architecture and 17-jewel configuration. The 39.7mm case size matches the dimensions of the 1960s references, and the step dial with applied Omega logo and dot-over-90 bezel complete the vintage-faithful design. The ceramic bezel with white enamel filling is the only concession to modernity, offering superior scratch resistance. Each caliber 321 movement is assembled by a single master watchmaker at Omega's atelier, and the caseback bears their individual stamp. This is the ultimate collector's Speedmaster — a watch that connects directly to the most famous timepiece in history.