Hi JM,
Your instincts are excellent, the ebay dude may be good and might stand behind his work, or he may be a ripoff.
Such is the world of ebay.
Omega will do exactly as you fear, replacing parts and resurfacing everything in sight for a very handsome amount of money.
As an heirloom watch, I recommend a complete going over by a proven, independent, sympathetic craftsman.
Give us an idea as to your location and we may be able to advise you on competent people that have served us well in the past.
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