Here's an ebay listing for the Bison Philatelic Society cinderella, suggesting it dates back to 1942. Note that it was originally issued in a larger souvenir sheet form with perforations around the "stamp". In your case, it appears those perforations were cut off:
Sorry it's a bit hard to read, but here's a story on the McKenzie Engraving Co. of Boston, Mass., who was the printer for the 1930 APS Convention Cinderella shown earlier in this thread:
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