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The Encyclopedia of Horology

France / Switzerland · 1840s–1850s, with numerous competing mechanisms

Keyless (Stem) Winding and Setting Work

Needs research

Keyless winding eliminated the separate winding key, made watches faster to set and wind, and reduced case wear at the winding hole; it became universal once reliable, robust mechanisms existed.

Adrien Philippe is widely credited with an early practical keyless winding mechanism, demonstrated at the 1844/1845 Paris exposition period and refined through the following decade with Patek's firm.

Multiple other makers filed competing keyless-work patents in France, Switzerland and England during the same period; the crown-wheel-and-clutch layout that became standard was the result of iterative refinement across several firms, not one single patent.

How to verify this yourself

French patent claims from this period are held by the Institut National de la Propriété Industrielle (INPI); Swiss claims predate the 1888 federal patent law and are harder to trace centrally. Exact patent numbers require direct archive search by applicant name and year; none are asserted here.

Manufacturers known to have used it

  • Patek Philippe
  • most Swiss and later American manufacturers by the 1880s–1900s

Sources & references

  1. Patek Philippe Museum, published company history (used for attribution claim only)
  2. INPI archive index — existence of period filings, not individually verified

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