I apologize if I've missed something, but I'm not really seeing why we would assume it is a proof rather than just from a sheet that wasn't finished. I see this all the time, a card that isn't complete being labelled as a proof. I have thousands of T cards with the alignment marks by the frame borders, they were included in productions long after proofing. T cards we can say are definitely proofs are beyond rare, there are very very few of them still around.
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