While I have a set of the 82 Blackless, and many of the transition cards with gray as well, I personally do not think of them as a separate set as checklisted in SCD, or variations. I think of them as recurring print defects
I agree that the defective backs should not be considered variations, but SCD, Beckett and the Registry have recognized several recurring, unintended print defects as variations.
There is no official definition of a variation and the term has been used inconsistently in the hobby.
Obviously PSA can choose to grade any defective card any way they choose...or not
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