I found this token while cleaning up.
The size and shape looks like it's from Small World, but I looked through my game and expansions and didn't see anything missing or any descriptions of a token matching it.
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This is a token from Small World: Realms. You can see it listed on page three of the Realms rules (PDF) in the top left. They're listed as: “1 Rusted Throne & 7 Miscellaneous Tokens to use in Scenarios of your own creation”. I'm not sure whether you ought to have multiple or just the one Knight token in Realms.