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The Encyclopedia of Horology

Calibre database

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Choose up to three movements to set their recorded specifications side by side. Rows where the records differ are highlighted; values are copied from each calibre's own page.

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Specifications

FieldPatek Philippe calibre 240
MakerPatek Philippe
CountrySwitzerland (Geneva)
PeriodIntroduced in 1977 and still in use in developed forms
Diameter27.5 mm
Height2.53 mm
Jewels27 jewels on the base calibre
Frequency21,600 vibrations per hour
Power reserveApproximately 48 hours
WindingAutomatic, by an off-centre micro-rotor
SettingCrown setting
EscapementSwiss lever
BalanceFree-sprung Gyromax balance
ComplicationsBase calibre; developed into perpetual calendar, moon-phase and world-time versions
ArchitectureAn ultra-thin automatic built around a recessed 22-carat gold micro-rotor rather than a full-diameter rotor, which keeps overall height low and leaves room for modules above the base movement.