First Series
Perpetual Calendar 3940 — First Series
Day and month printed flat on the dial surface (sunken sub-dials, no bevel), grave accent on “GENÈVE”, graced font. Solid caseback only; hallmarks on the case side opposite the crown. Yellow gold with silvered or gold dial; white gold and platinum with silvered dial only. Dated examples 1985–1987.
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.
Identifying details
- Perpetual calendar
Calendar that accounts for month lengths and leap years.
- Moon phase
Variants of 3940
Reference overview →| Variant | Production |
|---|---|
| Beyer Numbered Edition | 1985 |
| First SeriesCurrent | 1985–c. 1988 |
| First Series · Gold (Doré) Dial | Undated |
| Second Series | 1988–c. 1990 |
Case & movement
- Reference
- 3940
- Production
- 1985–c. 1988
- Case diameter
- 36 mm
- Movement
- Automatic
- Date
- Yes
- Caliber
- Patek Philippe 240 Q
Dial, bezel & hands
Unknown attributes are left out rather than guessed.
Movement
Patek Philippe 240 Q
Ultra-thin micro-rotor cal. 240 (1977) with a perpetual calendar module, introduced in the ref. 3940; one of the smallest and thinnest movements of its day. 22-carat gold micro-rotor.