Hi Leon,
I’m not quite sure what to make of these. Several showed up on the market a few years ago (I bought a handful of them). All were blank backs and all (as I recall) were trimmed down like that. T3 Proofs are blank backed but these aren’t proofs. T3s were constructed like a ‘sandwich’ with a very thin front and back paper attached to a thicker center piece. I’m guessing these may have never had the backs attached. As to why they were trimmed, I couldn’t say. Technically a rare back, but not a regular issue back.
Best,
Craig
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