Your watch looks like a gold filled / gold plated / gold Omega De Ville. You can check the case for a stamp or markings between the lugs. It is a front loader, so unless you have a lot of watch tools I don’t think you touch it.
Dial looks good from the pictures you provided. Crown also looks original and you have already indicated the crystal has an omega logo.
My suggestion would be to use some polywatch on the crystal and buy your son new strap. Does the strap have an omega buckle on it?
Then depending on where you live maybe someone can recommend a place for a service. I would service it locally in lieu of sending it to Omega.
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