Looks like one of these: South Korea City Bus Fare token
https://en.numista.com/catalogue/ex...a322254.html
https://en.numista.com/catalogue/ex...a383773.html
https://en.numista.com/catalogue/ex...a108304.html
https://en.numista.com/catalogue/ex...a322254.html
https://en.numista.com/catalogue/ex...a383773.html
https://en.numista.com/catalogue/ex...a108304.html
Inordinately fascinated by bits of metal with strange markings and figures