Just my opinion, but I think it's a combo of a couple of things happening. I believe it's mostly Polar Bear tobacco staining combined with a little bit of wear. Take a close look at the "7" with a loupe and I would guess you'll see the top of the "7" extending down to the border rather clearly. That's what I'm seeing with the pictures provided.
Still kind of neat though. It's a little like those Cheetos that people sell online that are shaped like Abe Lincoln, dogs, etc.
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