Welcome KK! I had similar doubts very recently and wanted to acquire cal 2xx Omega watch
The main problem that I had was that there are not a lot of resources that I could find on-line regarding those calibers
BTW Exactly the reason, why I decided to create account in this forum.
This is my original thread and I think it will be useful for you to have a look:
https://omegaforums.net/threads/omega-seamaster-cal-267.100438/ some great advice from forum members in there.
Answering your question - I wouldn't be buying any cal 2xx any time soon, simply because I am not knowledgeable enough to say is it fake, franken or both.
That being said as from yesterday I am very proud owner of cal 751 Constellation from 1968
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