Expert advice needed: Which watch…

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…might this case back have come from?
Dial unsigned apart from ‘omega’
Cal 420
Asking for a friend

Cheers in advance👍
 
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Looks like US collection from the number and the case OEM. Google told me it was an Omega watch without a model name.

You can Google too.
 
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I think the "J" indicates a case made by Jonell.
 
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Possibly Canadian-cased Jonell?
More likely US cased.

While some Omegas may have been cased in Canada, I don’t think there is a way to tell the difference, since licensed cases would have been made in the US.
gatorcpa
 
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Thanks everyone. This is the little bit extra that I love about OF!