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This plate for patent number 20877, dated November 16, 1921, is on a horse-racing slot machine. What does this patent cover and where was it issued?

Based on the date (November 16, 1921), it's not a United States utility or design patent. US utility patent 20877 and design patent 20877 were both issued several decades earlier. Also, I don't believe slot machines were patentable in the US at that time, since they weren't considered "useful" - however it's possible that the slot machine contained a patented device used in other non-gaming devices.

Edit: I've checked the USTPO, Google Patents, and Espacenet. Nothing matches both the date and patent number.

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  • I looked on Google Patents and The Lens and didn't find anything that matched either
    – Eric S
    Commented Mar 30, 2021 at 21:26
  • Yeah, I checked Google patents and the USPTO.
    – Bryan Wolf
    Commented Mar 31, 2021 at 1:52
  • I wonder if it isn’t a “pattern” number used only by the manufacturer.
    – Eric S
    Commented Mar 31, 2021 at 2:09
  • If "Pat" is for "Pattern", then the date could be a manufacture date. If we can establish that the device was manufactured at or around that date, then "Pattern" makes sense.
    – Bryan Wolf
    Commented Apr 2, 2021 at 16:29
  • It's all speculation from me. It the item a potential collectable?
    – Eric S
    Commented Apr 2, 2021 at 17:19

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