Movement record · Switzerland
Omega Calibre 321
VerifiedA hand-wound column-wheel chronograph descended from Lemania's ébauche design, finished by Omega and fitted to the earliest Speedmaster references; qualified by NASA testing and worn during the Apollo 11 lunar surface activity.
Technical specifications
- Diameter
- Approx. 27 mm (12 lignes)
- Height
- Approx. 6.7 mm
- Jewels
- 17
- Frequency
- 18,000 vph (2.5 Hz)
- Power reserve
- Approx. 45 hours
- Winding
- Hand wind
- Setting
- Pull-out crown
- Escapement
- Swiss lever
- Balance
- Bimetallic or monometallic balance depending on production date, with Breguet overcoil hairspring
- Complications
- Column-wheel chronograph
Identification features
- Column-wheel chronograph control visible when the movement is opened
- Lemania-derived bridge architecture
Known variants
- Pre- and post-war Lemania-derived variants used across several brands
Servicing notes
Specialist vintage-chronograph servicing recommended; parts for this discontinued calibre are increasingly scarce.
General guidance only. Antique movements should be serviced by a qualified watchmaker.
Historical significance
Closely associated with the Apollo lunar missions and among the most historically significant chronograph movements in wristwatch history.
Related photographs
No confidently matched photograph of this subject has been found yet. These photographs show a closely related record, and are not examples of the type described on this page.
Sources & references
- Omega historical and museum literature
- NASA equipment qualification records as cited in secondary histories
Where sources disagree, the disagreement is stated rather than resolved silently.