Movement record · Switzerland (Saint-Imier)
Longines calibre 30CH
Partially verifiedAn in-house column-wheel chronograph made by Longines itself rather than bought from a specialist ébauche house, with a flat, legible layout and a single register.
Technical specifications
- Diameter
- 29.8 mm
- Height
- Not recorded in a source consulted here
- Jewels
- 17 jewels on standard examples
- Frequency
- 18,000 vibrations per hour
- Power reserve
- Approximately 40 hours
- Winding
- Manual winding
- Setting
- Crown setting
- Escapement
- Swiss lever
- Balance
- Jewelled, with Breguet overcoil on better examples
- Complications
- Chronograph with column wheel and lateral clutch, Thirty-minute register
Identification features
- Signed Longines with the calibre number on the movement
- Column wheel visible under the chronograph bridge
Known variants
- 13ZN is the earlier related in-house chronograph calibre
Servicing notes
Parts are scarce and expensive; chronograph work on these movements should be entrusted to a specialist familiar with column-wheel work.
General guidance only. Antique movements should be serviced by a qualified watchmaker.
Historical significance
Evidence of Longines' standing as one of the few houses making its own chronograph movements in period rather than finishing supplied ébauches.
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
- Longines museum and heritage descriptions of its in-house chronograph calibres
- Production dates for individual calibre variants are recorded inconsistently across sources.
Where sources disagree, the disagreement is stated rather than resolved silently.