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The Encyclopedia of Horology

Calibre database

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Specifications

FieldLanderon 48
MakerFabrique d'Horlogerie de Fontainemelon / Landeron (Swiss ébauche trade)
CountrySwitzerland
Periodc. 1937 onward, with production continuing into the 1970s
DiameterApprox. 29.8 mm
HeightApprox. 5.8 mm
Jewels17 typical
Frequency18,000 vph (2.5 Hz)
Power reserveApprox. 40 hours
WindingHand wind
SettingPull-out crown
EscapementSwiss lever
BalanceMonometallic balance on later production
ComplicationsChronograph with 45-minute register, Subsidiary seconds
ArchitectureA cam-and-lever (shuttle) chronograph rather than a column wheel, designed for simpler and cheaper manufacture and adjustment, and supplied in very large numbers across the mid-century chronograph trade.