Movement record · Switzerland
Omega 30 mm calibre family (30T2 and derivatives)
Partially verifiedManual bridge calibre built for precision timekeeping
Technical specifications
- Diameter
- Approx. 30 mm
- Height
- Not recorded in the sources consulted
- Jewels
- 15 to 17 depending on grade
- Frequency
- 18,000 vph (2.5 Hz)
- Power reserve
- Approx. 40 hours
- Winding
- Manual, stem wind
- Setting
- Pendant set
- Escapement
- Swiss lever
- Balance
- Monometallic balance with alloy hairspring
- Complications
- Subsidiary or centre seconds by version
Identification features
- Omega calibre number stamped on the movement
- Distinctive large-diameter layout for a wristwatch of its period
Known variants
- Small-seconds and centre-seconds versions
- Chronometer-grade versions
Servicing notes
Cleaning, lubrication, mainspring and pivot work belong with a qualified watchmaker working from calibre-specific documentation. Conserve original parts: replacing a worn component with a modern substitute changes the object, and refinishing plates or dials destroys evidence.
General guidance only. Antique movements should be serviced by a qualified watchmaker.
Historical significance
Widely regarded as one of the most successful precision wristwatch calibre families of the mid-twentieth century.
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
- de Carle, D., Watch and Clock Encyclopedia
- Period trade material catalogues and calibre reference compilations (edition-dependent)
- Published manufacturer technical documentation where available
Where sources disagree, the disagreement is stated rather than resolved silently.