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The Encyclopedia of Horology

Component record · Escapement

Screwed Jewel Setting

Partially verified

A jewel in a metal chaton secured by screws.

What it does

Allows a jewel to be positioned and replaced without pressing the plate.

How it works

The chaton can be adjusted or removed, which simplifies precise endshake setting and later replacement.

Evolution

Largely displaced by pressed jewels in industrial production.

Known variations

  • Gold chaton
  • Brass chaton

Identification for collectors

  • Visible screws around a jewel indicate a screwed setting.

Common failure modes

  • Lost screws
  • Cracked jewel in a distorted chaton

Diagram

crownsliding clutchsetting wheelswinding pinion and ratchet
Schematic: keyless winding and hand setting. 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.