What about T206 proofs? They have the proof markings on the fronts and are blank-backed. Would SGC consider them to be a different category of blank-backed T206's and grade them? Such cards IMO are fundamentally different because being proofs they were manufactured with no intent of having the versos be anything other than blank-backed, and to my knowledge the fronts are full production run versions (i.e., at the time of manufacture they were not missing any intended features).
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