3941s were made in the first four years of the reference as some customers wanted a clear caseback in order to see the movement. By 1990 the 3941 was stopped as the 3940 became regularly available with the sapphire crystal caseback.
I wore one every day for several years and just can’t say anything bad about the watch. How long did your watch spend at Henri Stern before you got it back? Congratulations on having such an excellent example of a Patek Philippe.
It went in for an assessment but also some "authentication" work, as a dealer I know raised some questions about its origin. It resulted in an all clear from Patek Philippe and an Extract from the Archive backing everything up that they examined and confi...