Is the 1990 topps baseball partial blackless cards only from 1st print runs, and is there only certain "letters" ie; A* B* C* etc...on the back ? Thanks
There is a long thread on this somewhere.
They are all on the F* sheet. I don’t know about a first print but they are only found in wax packs and rak packs.
Look through this https://forums.collectors.com/discussion/709331/1990-topps-frank-thomas-nnof-revisited-introduction-to-my-theory/p1
One of the best threads in the history of this forum.