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The Encyclopedia of Horology

Calibre database

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Specifications

FieldA. Lange & Söhne calibre L921.4
MakerA. Lange & Söhne
CountryGermany (Glashütte)
PeriodFrom the mid 1990s
DiameterNot recorded in a source consulted here
HeightNot recorded in a source consulted here
JewelsNot recorded in a source consulted here
Frequency21,600 vibrations per hour
Power reserveApproximately 45 hours
WindingManual winding
SettingCrown setting, with the outsize date advanced by a pusher
EscapementSwiss lever
BalanceScrewed balance with swan-neck fine adjustment
ComplicationsOutsize date, Power-reserve indication on the Lange 1 family
ArchitectureA three-quarter plate movement in German silver with gold chatons, blued screws and hand-engraved balance cock, laid out so that the asymmetric Lange 1 dial has each indication over its own mechanism.