I am negotiating with children's TV Star "The Count" from SezMe street to give you an accurate number.
Funny thing about that guy is that to retain his services, you have to tell him how many cards you need counted
I think I lost track @500 pre-1980 HOFers, only counting the guys in the Topps Era once as I generally pick one I like for my HOF collection.
My prewar collection is about 2/3 slabbed and the other third might get done this year...maybe. See my link below!