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The Encyclopedia of Horology

Movement record · Switzerland

Landeron 248

Partially verified

Cam-switched manual chronograph

Technical specifications

Diameter
Approx. 29 mm
Height
Not recorded in the sources consulted
Jewels
17
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
Complications
Chronograph with minute register

Identification features

  • Cam switching rather than a column wheel
  • Landeron calibre marking

Known variants

  • Landeron 48 predecessor
  • Variants with differing register layouts

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

The cam-switched chronograph that brought the complication within reach of ordinary buyers, in contrast to column-wheel calibres.

Diagram

top plate or bridgespillar platebalance and cockwheel train between the plates
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

  1. de Carle, D., Watch and Clock Encyclopedia
  2. Period trade material catalogues and calibre reference compilations (edition-dependent)
  3. Published manufacturer technical documentation where available

Where sources disagree, the disagreement is stated rather than resolved silently.