Calibre record · Manual chronograph
Omega calibre 321
Documented
Developed with Lemania (calibre 2310) and used in the first Speedmasters from 1957; it was the movement of the Speedmaster qualified by NASA in 1965.
- Manufacturer
- Omega
- Type
- Manual chronograph
- Winding
- Manual
- Production
- 1946–1968; re-introduced 2019
- Country
- Switzerland
- Diameter
- 27 mm (12 lignes)
- Height
- Undocumented here
- Jewels
- 17
- Frequency
- 18,000 vph (2.5 Hz)
- Power reserve
- c. 44 h
- Oscillator / escapement
- Detached lever escapement
- Complications
- Column-wheel chronograph with lateral clutch (30-minute, 12-hour counters)
Figures are those commonly published for the standard version; individual versions and grades differ. “Undocumented here” means the value has not yet been confirmed for this record.
History
The 2310/321 family was also used by Patek Philippe, Vacheron Constantin and Breguet as a base for high-grade chronographs. Omega replaced it with the cam-actuated 861 in 1968 and revived the 321 in 2019.
