I don't think the white backs are proofs. They were available at retail in some areas. I forget which were the tougher ones. It was a really widely distributed test, unlike some of the others. One of the packs- I forget if it was the three or 5 pack was carried by Toys r us. (I'm thinking the three pack? One of the packs was a lot tougher than the other)
Is the Schmidt typical for your set? And is the set a white back set?
It looks like the blue for the signature is missing, maybe another too since the color seems off. Or maybe a bad scanner setting?
If it's not a bad setting and they're all like that maybe you picked up a set of progressive proofs, or an error set.
Steve B
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