The Omega Caliber 321 is not just a watch movement — it is arguably the most culturally significant chronograph caliber ever produced. First introduced in 1942 as the Lemania 2310 (or Omega 27 CHRO C12), it went on to power the Speedmaster that traveled to the moon on the wrist of Buzz Aldrin in 1969.
What Makes It Special
The 321 is a column-wheel chronograph with a lateral clutch coupling. Its design is elegant in its simplicity: 17 jewels in its original form, later increased to 18, with a beat rate of 18,000 vph. The column wheel mechanism provides a smoother, more precise engagement of the chronograph function compared to the cam-switching mechanisms found in less expensive alternatives.
When you press the chronograph pusher on a 321-powered watch, the tactile feedback is distinctly different from modern movements. There is a mechanical precision to it — a deliberate click rather than the mushy resistance you get from cam-actuated chronographs.