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The Encyclopedia of Horology

Calibre database

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Specifications

FieldLongines calibre 30CH
MakerLongines
CountrySwitzerland (Saint-Imier)
PeriodMid twentieth century
Diameter29.8 mm
Height6.2 mm
Jewels17 jewels on standard examples
Frequency18,000 vibrations per hour
Power reserveApproximately 40 hours
WindingManual winding
SettingCrown setting
EscapementSwiss lever
BalanceJewelled, with Breguet overcoil on better examples
ComplicationsChronograph with column wheel and lateral clutch, Thirty-minute register, Chronograph, Flyback
ArchitectureAn in-house column-wheel chronograph made by Longines itself rather than bought from a specialist ébauche house, with a flat, legible layout and a single register.