I think the George Moll proofs have blank backs. There are a few on eBay from other years. I have personally seen some of George Moll’s cards in binders with unissued cards. They were on mini-sheets. I didn’t pull them out and look at the backs. I do have two 1956 Bowman Football cards that supposedly were part of George Moll’s collection. That were proofs and unissued. They to were blank-backed.
Maybe they ran out of paper stock and substituted the white stock paper?
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