Perpetual Calendar 3940
1985–20078 variants
Slim (9 mm) micro-rotor perpetual calendar with three sub-dials: day with 24-hour at 9, month with leap year at 3, date with moon at 6. Patek’s first perpetual made in large numbers; Philippe Stern wore one daily. Made in yellow, pink and white gold and platinum; Stern Frères dials.
Collectors divide production into series; the first 25 were numbered dials for Beyer. Hallmarks move from the case side to the lugs as production advances.
Variants over time
All recorded years
19852009
198519901995200020052010
Faded ends mark approximate or unknown dates. Years are as stated by the cited sources.
Reference specifications
- Brand
- Patek Philippe
- Model
- Perpetual Calendar
- Reference
- 3940
- Category
- Dress
- Production
- 1985–2007
- Case diameter
- 36 mm
- Date
- Yes
- Movement
- Automatic