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The Encyclopedia of Horology

Component record · Dial & hands

Date Jumper Spring

Partially verified

Strong leaf spring

What it does

Positions the date wheel exactly

How it works

Evolution

High tension component

Known variations

    Identification for collectors

      Common failure modes

      • Snapping

      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.