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The Encyclopedia of Horology

Calibre database

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Specifications

FieldLongines Calibre 13ZN
Makerlongines
CountrySwitzerland
Period1936 – 1950s
DiameterApprox. 29 mm (13 lignes)
HeightNot fully documented in accessible sources
JewelsApprox. 17–19
Frequency18,000 vph (2.5 Hz)
Power reserveApprox. 36–40 hours
WindingHand wind
SettingPull-out crown
EscapementSwiss lever
BalanceBimetallic balance with Breguet overcoil on the finest examples
ComplicationsColumn-wheel chronograph, Flyback function on some references
ArchitectureA highly regarded pre-war and post-war column-wheel chronograph movement, valued by collectors for its finishing and its flyback function on certain references.