One of our Connie experts will be able to help I'm sure.
Just my observations.
It's a very nice example condition wise and after a service will be a great watch to wear and remember your Grandpa by.
I would not let Omega touch the watch. A normal clean, oil and adjust service can be done by any competent watchmaker. Make sure you stipulate exactly what you want done, e.g. do not polish the case or clean the dial, but a new replacement crystal would be OK, although that one would come up with a polish.
Good Luck with it.
Cheers
Jim
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