This watch is accompanied by a Patek Philippe Certificate of Origin and Extract from the Archives confirming production of this watch in 1989 and its subsequent sale on 15 February 1990.
Reference 3941 is possibly the rarest variant of the 3940 family of automatic perpetual calendar wristwatches. Since the glazed backs were not numbered, Patek Philippe chose instead to apply the case number inside the upper case part, underneath the bezel.
Manufacture of references 3940 and 3941 was launched in 1985, the difference between the two reference numbers being their backs:
- ref. 3940: plain snap on back
- ref. 3941: glazed snap on back
To respond to their customers increasing demand for the two backs, Patek Philippe produced the model as of around 1988 with both the plain and the glazed snap on back. Production of reference 3941 was discontinued in 1990.
This model is illustrated in Patek Philippe Wristwatches by Martin Huber & Alan Banbery, second edition, pp. 292 & 293.