Kaito Tsuho

Japanese: 海東通宝 - かいとうつうほう

A copper coin from the Goryeo Dynasty in Korea. The first minted currency in Korea is said to be the Kengen Choho coin of 996, but later, at the end of the 10th century, the government established a mint office to issue silver coins and minted 1,500 kan of Haedong Tongbo coins, which were distributed to officials for circulation. It is circular with a square hole in the center and the four characters Haedong Tongbo engraved on the top, bottom, left and right. Haedong means Korea. Around this time, several types of iron and copper coins, such as the Samhan Tongbo and the Samguk Tongbo, were issued, but they did not become widespread nationwide.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

朝鮮，高麗時代の銅銭。朝鮮における最初の鋳造貨幣は996年の乾元重宝とされるが，そののち10世紀末にいたり，政府は鋳銭官を設けて銀貨を発行するとともに，海東通宝1500貫を鋳造，官人らに分配して流通を図った。円形で，中央に正方形の穴があり，上下左右に海東通宝の4文字が刻まれている。海東とは朝鮮を意味する。これに前後して三韓通宝･三国通宝など数種の鉄銭･銅銭が発行されたが，全国的な普及をみるには至らなかった。

出典　株式会社平凡社世界大百科事典第２版について　情報

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