"There is the same chance of it being from Ernie Primm as any of the other options I gave in the first post."

If there were 600 casinos in the US (including illegals) in the 1950's and only 3 owned by Primm, the odds would be 199 to 1 it was a Primm chip.
I think any suggesting it is a Primm chip is doing a dis-service to the hobby.
That said, it is a nice UFC arodie and worth the price, IMO.