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Posted By: JimB

Travis,
They are very cool cards (I own 3 E93 black backs myself) and probably cut from an uncut sheet that had not completed production (no back printing). They may very well have been used as "proofs" (meaning they were used to check for errors before a full run was produced), but usually collectors like to see hash marks in the borders before they call a card a "proof". I think that if it was used to "proofread" the card for any errors, then "proof" may not technically be the wrong term. Most would just call them "blank backs" to be safe. With hashmarks, we can be certain that they were used as proofs. Without them, we are uncertain. Others might use the less appealing term "printer's scrap".
JimB