Thank you for all the help Zaf. Here is better foto (for future reference?)

Thank you, Zaf! Are they often counterfeited? I would greatly appreciate your input as information about vintage Cartier is so hard to come by. I did find a couple of ads from the period for Cartier triple calendars, they existed in two sizes and in steel as well as in precious metals with some vari...

I was wondering if I could ask for the expert opinion on this Cartier that is clearly a JLC triple calendar manufactured for Cartier. What I wonder is the approximate date of manufacture and if the extra four digit numbers on the case back (inside and outside) can be traced to JLC or if they are rel...