Blank front card is the one I have, blue box with no Frank Thomas name, kept in a safe deposit box at a bank. My grandpa had about 100+ error cards that he kept in a separate binder. He didn't realize that the Thomas card and others had value until I was about 14 and did some research into it 25ish years ago. Most of the entire collection is junk like all, but that card and a few dozen more make up for it.
