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Really, it's up to you. A decent service on a vintage watch will cost $500 in the US easily unless you're one of those rare individuals who knos someone worth a damn to trust your watch to (and those people ought share their source before complaining "it's too much").
Factory service depends on what you ask for, and yes, there are examples on here, though I am not sure how to help you find them.
Omega advertises two levels of service, an automatic for $550 and I assume redial extra, and $1500 for something so exotic they must remake the parts.
Really, it's up to you. A decent service on a vintage watch will cost $500 in the US easily unless you're one of those rare individuals who knos someone worth a damn to trust your watch to (and those people ought share their source before complaining "it's too much").
I tell the story of my father's wedding watch. It was way more important to him than his wedding ring, which he never wore. At some previous service, some dipshit scratched the dial removing the hands. After that, and as the silver dial started tarnishing a bit, he was always asked, do you want to refinish the dial? He always said "NO!"
You knew your dad, follow your gut on this one. But you have plenty of alternatives, and I am confident you will find one that suits you.