It used to be that a PSA 9 was equal-ish to a raw but that has changed since the grading backlog and price increases so it could end up being a PSA 8 is equal to a modern raw - if you can't find any there might not be any recent sales and it is /49 so not as common!
I'd say 50-70% of the value of a PSA 9 would be a decent range