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The Encyclopedia of Horology

Component record · Dial & hands

Calendar Finger

Partially verified

Small projection

What it does

Advances the calendar wheel once per day

How it works

Evolution

Timed to advance at midnight

Known variations

    Identification for collectors

      Common failure modes

      • Bending

      Diagram

      date ring, thirty-one positionsdate aperturedriving wheel and jumper
      Schematic: calendar work under the dial. 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., Practical Watch Repairing
      2. de Carle, D., Watch and Clock Encyclopedia
      3. Daniels, G., Watchmaking

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