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The Encyclopedia of Horology

Calibre database

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Specifications

FieldJaeger-LeCoultre Calibre 920
Makerjaeger-lecoultre
CountrySwitzerland
Period1967 – 1970s (as supplied); later revived under related references
DiameterApprox. 28 mm
HeightApprox. 2.45 mm
JewelsApprox. 28
Frequency19,800 vph
Power reserveApprox. 40 hours
WindingSelf-winding with a peripheral micro-rotor
SettingPull-out crown
EscapementSwiss lever
BalanceConventional balance with flat hairspring
ComplicationsDate on some applications
ArchitectureAn extremely thin automatic movement using a 22-carat gold peripheral micro-rotor rather than a full rotor, allowing exceptional slimness; supplied by Jaeger-LeCoultre to several prestige houses and adapted as the basis for celebrated in-house calibres elsewhere.