Hi Jason,
I'm not a watchmaker, but the movement looks relatively clean for a watch that probably hasn't been serviced in a long time! There are some watchmaker's markings on the inside of the case back, though, so it has been serviced at some point. Maybe it's the picture quality, but I see some smudges around the main spring and the screw around 2 o'clock seems rusty. You can try and find a watchmaker who has experience with Omega movements, preferably someone certified. I reckon some UK folks out here can recommend particular watchmakers. The cost of servicing will be a couple hundred, just so you know.
As for present-day value: hard to tell. The Dennison case seems to
suggest premium prices, which would also depend on the karat count.
It's a beautiful, nearly untouched watch, and the personal value it has to you must be tremendous. If you take good care of it, you can one day pass it on!
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