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The Encyclopedia of Horology

Calibre database

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Choose up to three movements to set their recorded specifications side by side. Rows where the records differ are highlighted; values are copied from each calibre's own page.

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Specifications

FieldLépine Calibre (bar movement)
Makergeneva-trade
CountryFrance / Switzerland
Periodc. 1770 onward
DiameterVaries
HeightNotably thin for its date
JewelsVariable; often jewelled to the escapement only
FrequencyTypically 14,400–18,000 vph
Power reserveApprox. 30 hours
WindingKey wind, later keyless
SettingKey set, later pendant set
EscapementCylinder or lever depending on period
BalanceFlat or Breguet overcoil hairspring by the nineteenth century
ComplicationsSubsidiary seconds on some examples
ArchitectureJean-Antoine Lépine's abandonment of the full top plate in favour of separate bars and bridges mounted on a single plate, removing the fusee and allowing a dramatically thinner watch.