Skip to content
The Encyclopedia of Horology

Calibre database

Compare calibres

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.

Choose

Movements to compare

Side by side

Specifications

FieldJapy Frères ébauche
MakerJapy Frères, Beaucourt
CountryFrance
PeriodNineteenth century
DiameterSupplied in many sizes
HeightVaries by size
JewelsSupplied unjewelled or partly jewelled, to be finished by the buyer
FrequencyNot applicable as supplied; determined on finishing
Power reserveDetermined by the finished movement
WindingSupplied for key wind or keyless finishing
SettingDetermined on finishing
EscapementSupplied without escapement on many ébauches; cylinder and lever both common when finished
BalanceFitted at finishing
ComplicationsNone as supplied
ArchitectureRough movements made by machine in large quantities and sold unfinished to watch and clock establishers, who fitted escapements, jewelling, dials and cases.