Movement record · Switzerland
Longines 30CH
Partially verifiedColumn wheel
Technical specifications
- Diameter
- 29.8 mm
- Height
- 6.2 mm
- Jewels
- 17
- Frequency
- 18000 vph
- Power reserve
- 44 h
- Winding
- Manual
- Setting
- Stem
- Escapement
- Lever
- Balance
- Screw
- Complications
- Chronograph, Flyback
Identification features
Known variants
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
Refined flyback chronograph
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.