Movement record · Switzerland (Geneva)
Patek Philippe calibre 240
VerifiedAn 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.
Technical specifications
- Diameter
- 27.5 mm
- Height
- 2.53 mm
- Jewels
- 27 jewels on the base calibre
- Frequency
- 21,600 vibrations per hour
- Power reserve
- Approximately 48 hours
- Winding
- Automatic, by an off-centre micro-rotor
- Setting
- Crown setting
- Escapement
- Swiss lever
- Balance
- Free-sprung Gyromax balance
- Complications
- Base calibre; developed into perpetual calendar, moon-phase and world-time versions
Identification features
- Off-centre gold micro-rotor sunk into the movement plate
- Geneva finishing with Gyromax balance
Known variants
- 240 Q perpetual calendar
- 240 HU world time
- 240 PS with small seconds
Servicing notes
Factory or specialist service only; the micro-rotor bearing and free-sprung balance both require specialist tooling.
General guidance only. Antique movements should be serviced by a qualified watchmaker.
Historical significance
One of the longest-serving thin automatic calibres in production, and the base on which much of Patek Philippe's complicated output has been built since the late 1970s.
Related photographs
No confidently matched photograph of this subject has been found yet. These photographs show a closely related record, and are not examples of the type described on this page.
Sources & references
- Manufacturer technical descriptions of the calibre 240 family
Where sources disagree, the disagreement is stated rather than resolved silently.