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Seth B.Dave at gfg.com had a find a few years ago, but I haven't seen more since. They seem like the sort of small regional issue that might suddenly appear in yard sales and estate auctions in NC or VA, but I feel like there are 30-40 out there total right now. What's weird, I think, is the variety of backs with so few different fronts, as if every one was stamped with a different back or something.