Proofs
As I recall Bob Lemke reported that the 3 famous 1960 cards of Hadley, Cimoli and Theoneberry on team different from those in the issued set that he saw had regular backs. Would that make them variations rather than proofs ?
Generally agree that the only way to be sure you have a blank back proof is if front differers from regular card like is the case with the well known 77 and 84 catalog proofs
But Topps Vault has issued a bunch of blank back serial or progressive proofs
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