There are also a lot of online auctions. You can find them on sites like the salesroom, etc. I would say a watch like yours would fetch not more than EUR 350/400 on open auction. I bought dozens of seamasters in way better condition for under EUR 500.
@Edward53 is giving you some very good advice. Focus on a couple of models and start there. If in doubt, post here. People will help you. Good luck!
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