Kaigen Tongbao

Japanese: 開元通宝 - かいげんつうほう

A bronze coin minted in 621 by Emperor Gaozu of the Tang Dynasty in China. Kaiyuan is not an era name, but rather means opening the country, commemorating the founding of the Tang Dynasty. There is also a theory that the correct reading is Kaitong Genbao, with the coin written clockwise. It continued to be issued until the end of the Tang Dynasty. It weighed 2.4 shu (about 1 momme, 3.7g), and became the standard for subsequent coins. Japan's Wado Kaichin was also minted after this model.
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Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

中国，唐の高祖が621年に鋳造した青銅貨。開元は年号ではなく，開国の意味で唐朝創立を記念したもの。銭文を右回りに開通元宝と読むことが正しいという説もある。唐末まで引き続いて発行。重さ2.4銖(しゅ)（約１匁，3.7g）で，以後の銭貨の基準となり，日本の和同開珎(かいちん)もこれにならって鋳造された。
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