Glossary · Mechanism
Keyless works
The lever and clutch system allowing winding and hand-setting via the crown, without a key.
Explanation
Keyless works are the parts that let a crown or pendant wind the mainspring and set the hands without a separate key. The common later sliding-clutch system uses a stem, winding pinion, sliding pinion or clutch, yoke, setting lever and setting train. Earlier keyless inventions, including Philippe-type systems, can solve the same problem with different geometry.
A keyless fault visible at the crown does not identify a single failed part. Slipping, grinding, failure to set, failure to wind or a crown that pulls out can involve the stem, clutch teeth, yoke spring, setting lever, winding pinion, motion work or case tube. The mechanism is often under the dial, so safe diagnosis requires calibre-specific knowledge.
Sources & references
- Cutmore, M., Watches 1850–1980 — keyless development
- de Carle, D., Practical Watch Repairing — keyless work
Where sources disagree, the disagreement is stated rather than resolved silently.
What to record
- Record whether winding and hand-setting both work before assigning a cause.
- Distinguish early keyless patents from the later sliding-clutch pattern.
- Use calibre drawings or exact photographs when naming parts.
Do not force a reluctant crown or pull farther than the mechanism allows.
In the object catalogue
Catalogued objects whose own source record mentions “Keyless works”. The quoted line shows where; it is the seller’s or museum’s wording, not independent verification.
