One more rambling thought. Fred says they are not proof cards even though blank backed because they are not a proof of the issued cards. Rather he views them as a test design card that was replaced by a different design
Another example would be the Topps 1984 blank backed Head in the Box or Encased set of 66 cards, which differ from the issued cards in that the insert face is fully contained in the inset box rather than extending beyond it as with the issued cards. Fred would say they are not proof cards but rejected test design cards. To me that is semantics. I think they are proofs for an unissued design. But folks can call them whatever they want
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