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Looks like a gold plated 1960s Omega Geneve, probably a caliber 600 or a close cousin.
For more specific information you would need to see inside the watch.
It's a handsome watch, probably not particularly valuable or rare. Looks like it's had some water ingress. Please post a pic of the inside of the caseback.
If this were mine, I would find a local, competent, independent watchmaker, and have it serviced.