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Butch & Co.Never did see it come up for auction on eBay, but that very plate (or its identical twin) was indeed the subject of fairly lengthy discussion on one of the eBay member forums a few months back. If memory serves, it was the pottery and ceramics collectors on the "Collectibles" board there who were trying to nail down its origin, with a minority opining that it was of more recent manufacture.
We did some extensive searching for that debate, but unfortunately, the thread seems to have been deleted from the boards there.