Movement record · Switzerland

Lemania 2310 (and 861 relations)

Partially verified

Column-wheel manual chronograph

Technical specifications

Diameter: 27.0 mm
Height: Not recorded in the sources consulted
Jewels: 17 to 18 depending on version
Frequency: 18,000 vph (2.5 Hz) in the 2310 generation
Power reserve: Approx. 44 hours
Winding: Manual, stem wind
Setting: Pendant set
Escapement: Swiss lever
Balance: Monometallic balance
Complications: Chronograph with minute and hour registers

Identification features

Column-wheel switching visible on the chronograph side
Frequently signed by the brand rather than Lemania

Known variants

Later cam-switched derivatives
Versions with differing finishing levels

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

One of the most respected manual chronograph architectures of the twentieth century, and the basis of several historically important watches.

Diagram

Schematic: plate and bridge layout. An outline schematic drawn to show the arrangement of the parts discussed here. It is not a dimensioned working drawing and does not depict a particular maker's calibre.

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.