Likely due to the fact that these are not in fact proof cards, but more likely a sheet that did not receive the black color pass on the front with the names/teams and the back not printed. True proofs would usually have alignment marks on all four borders. Further as indicated in the REA write-up, it's possible they were cut from an ad sheet as well. You will also note they use the term "proofs" in quotations, indicating they were a bit unsure of what they were at the time.
Last edited by sb1; 03-29-2024 at 09:44 AM.
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