It doesn't look like any sort of normal proof to me.
I see the cross marks, and it is obvious that all of the color isn't there. Those features seem consistent with proofs.
What looks wrong to me are those lines that Ted mentions. If card stock had been used to print proofs there would be no vertical lines where the cards would have been separated. In looking at the places where it looks like the cards have lost their surface, it makes me think that what was printed there was printed on paper, not on card stock. Then, those pieces of paper were assembled onto a piece of card stock.
I do think it is something that would have come out of the shops of American Lithograph. But it looks assembled because of those lines. If it was just a proof on card stock, then there would be no vertical lines where the cards would be cut, there would only be the proof cross marks.
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