Can anyone identify this found coin

Stumbled across this in a junk box from a garage sale...any ideas

i can't seem to lay my hands on a ruler right now but its roughly the size of a canadian loonie...so about 26mm

Edited 7 years ago

Hello, it should be Korean. I'm not specialist of those, but I think it's Sang Pyong Tong Bo and coin inscription: 常平通寶.

Hope that helps.

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