Japan? by Howard Ryan posted Jun 17, 2021 at 8:43 AM see photo above; I might be blind but I swore it was 10 yen Japanese coin but cannot find it anywhere.
The reverse matches a 1 Chio/Chiao Japanese Manchurian occupation coin, I don't see any other reverses like that, but seeing both sides could help confirm. Numista: https://en.numista.com/catalogue/pieces14968.html