I came across this one recently and thought it might be part of one of the U.S. "Abstract Art" sets I'd seen, but I don't think it is. Imperf top and bottom, perforated left and right. (or maybe it's the other way around, depending on orientation) It looks to have been canceled while on piece and no visible text. Is it just a seal, or...?

Thanks for any help,
WB

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