You can see details of your watch here:
https://www.omegawatches.com/en-gb/watch-omega-seamaster-cosmic-2000-cd-166-0128
It's a Cal 1012 which is eminently serviceable by any watchmaker with an Omega account (hell, even one without but be careful as you're looking for someone to trust with your heirloom). As I've often said before, if you're willing to post your approximate location it's likely that there's a member close enough to you who can recommend a watchmaker.
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