Hi, I too have a Seamaster De Ville that my grandfather left me. It is 18ct gold, so I don't wear it much as I prefer S/Steel cases. I can't be sure if your example is S/S or gold, difficult to tell.
Your predicament is far from straight forward. If it were a vintage Speedy that had just been pulled from the back of the draw, and you weren't a vintage watch enthusiast who intended to keep/wear it, I'd suggest leaving it as found, not do anything, and just sell as a genuine un-messed with example. But these old Seamasters are far less valuable, and don't have the 'barn find' allure of an old Speedy, so really I guess it depends on what you intend to do with it? If you fancy wearing it, then it will need a service, but not from any old back street watch repairer - find someone with a background in vintage and/or Omega watches, get rec's etc, and enjoy it. But bear in mind that a service will likely cost around a third to half the value of the watch (ballpark, depending where you take it of course). But if you sell, then the condition/lack of service etc will knock the value proportionately more than the same scenario with a vintage Speedy.
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