Nice watch! Looks like a Seamaster Calendar from the early to mid 1950s. You’d have to have a watchmaker open the back to confirm details but my guess is reference 2757 with a 355 movement. Looks like the watch was also originally purchased from the retailer Turler, hence the wording on the dial. The crown has been replaced with a generic one, but the correct one can be installed when you get it serviced (which you probably need to).
Here’s one of mine - note my crown is also incorrect.
View attachment 728267
Hers the crown you need:
View attachment 728271
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