Need your help to identify a seamaster`s caliber

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Ok, I did everything according to Jim's recommendations.2 minutes of manipulation and case back came off.So it is a 18k gold, as you can see from the pictures and movement looks good too.Thanks again for the suggestion. Definitely going to keep this watch.
 
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Good result 👍

It looks like the watch has been serviced in the past (not all that gently though).
The rotor bush is starting to show signs of wear (circular marks around the inside of the caseback and wear on the bevel edge of the rotor).

Probably would do no harm to get it serviced while parts are still readily available.
 
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I am definitely going to service it, just need to find good watchmaker in the area.I was also thinking about glass replacement. Any thoughts on that one?