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I *think* the term often used to describe this lug style is "twisted", at least when talking about Speedmaster and Seamaster cases (as opposed to straight lugs). So maybe using that in your search will yield more results.
I'm just a beginner on SM300 but this is the first time I see these king fo facets (Like the CB facets on -65 Speedmasters) on one of them.
So my guess it that the case in the current condition is not original
The whole watch looks like the parts are a strange kind of mixture so if you intend to buy it be very careful.
https://omegaforums.net/threads/165-024-seamaster-300-hf-vs-cb-case.64678/