Cho Son Tong Bo ("Choson universal currency"), inner and outer rims / Blank, inner and outer rims. 24mm, 2.74 grams. Hartill #25.73.

"Choson" was one of the old names for Korea. The coins bearing the inscription "Cho Son Tong Bo" were continuously issued in Korea between 1423 and 1678.

Greenish patina, much oxidation of the surfaces, as usual for these.

This coin is unconditionally guaranteed to be authentic.