Information about the reference 3940
recently, I have seen many posts of the Patek 3940 on the forum. My interest for this reference is growing and I am looking for information about this beautiful model.
According to what I have read so far, it seems that many series were produced.
I have quickly searched on the Internet and I have not found any good articles presenting the different series and highlighting their differences. I have noticed this interesting article
which talked about the history of Patek Philippe's perpetual calendar. However, it does not describe the different series of the 3940.
I would like to know if you are aware of any good article that would talk about the specificities of each serie of the 3940 or, if possible, if you can tell me how many series were produced and what are the main differences.
As a subsidiary question, I have noticed that some versions have half of a circle of the indicator on the left in yellow. Is it normal or does it come with time?
Thank you very much in advance
Have a good day