Thanks VERY much for the ID on the model name! I did see that one and thought it was a good match. Here is the inside case picture. I am curious as what all the different numbers mean, if you look closely, there are 3 sets of letters and numbers. 2 at the top and one sideways at the bottom?
Numbers and code inscribed in the casebacks of watches are watchmaker's marks, and they follow no set format. Each watchmaker has their own identifying system, even if you are working in a depot. Basically, each set of marks identifies a repair, or possibly a full service. The marks mean that someone has taken care of the watch, hopefully!
Mechanical watches should be fully serviced every 4-6 years, but it is rare that I see the proper number of service marks.
In reply to The ad above looks to by Andersok