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The Encyclopedia of Horology

Calibre database

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Specifications

FieldA. Lange & Söhne Calibre L901.0
Makera-lange-sohne
CountryGermany
Period1994 to the mid-2000s (original Lange 1 calibre)
DiameterNot fully documented in accessible sources
HeightNot fully documented in accessible sources
JewelsApprox. 53
Frequency21,600 vph (3 Hz)
Power reserveApprox. 100 hours (two mainspring barrels)
WindingHand wind
SettingPull-out crown
EscapementSwiss-type lever, in-house manufacture
BalanceScrewed gold balance with in-house hairspring in later production
ComplicationsOutsize date (Grossdatum), Power-reserve indicator
ArchitectureThe manual-wind movement introduced in the Lange 1, the flagship model of the relaunched A. Lange & Söhne after German reunification, notable for its asymmetric dial layout and dual-barrel long power reserve.