Reference
Ref. 3940
Patek Philippe's perpetual calendar introduced in 1985, driven by the ultra-thin micro-rotor calibre 240 Q.
- Introduced
- 1985
- Calibre
- 240 Q
Go deeper
5 directions from here
Sister referenceRef. 3970Its perpetual-chronograph sibling from 1986.Reference
Next generationRef. 5140Same calibre 240 Q, larger case, 2006.Reference
ComplicationPerpetual calendarWhat the 3940 actually does, and why it is hard.Complication
Made byPatek PhilippeThe house behind it.Maison
Key figureThe Stern familyMade for 22 years under the Stern family.Person
