Legs - Oashi

...The Hongwu Tongbao, Yongle Tongbao, and Xuande Tongbao coins of the Ming Dynasty are the most representative of Chinese coins. As the circulation of coins from China got on track, during the Muromachi period, Chinese coins were called Ato, Choyomok, and Gagan based on their appearance, and Gokyaku, Ujou, and Ryosoku based on their use. As Chinese coins became more widely used in Japan, privately minted coins and imitation coins modeled on the Chinese officially minted coins appeared, and the official coins were generally called good coins or refined coins, while the privately minted coins and imitation coins were called bad coins or bitasen. ...

*Some of the terminology explanations that mention "Mikyaku" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…明銭の洪武通宝，永楽通宝，宣徳通宝などは中国銭のなかでも最も代表的なものである。中国渡来銭の流通が軌道に乗るようになると，室町時代には中国銭を形態のうえから阿堵（あと），鳥目（ちようもく），鵝眼（ががん）などと呼び，また使用の面から御脚，用途，料足などととなえるようになった。中国銭の国内通用が盛んになると，中国官鋳制銭をモデルにして造られた私鋳銭や模造銭が現れ，官銭は一般に良銭，精銭と呼ばれ，私鋳銭，模造銭は悪銭または鐚銭（びたせん）ととなえられた。…

※「御脚」について言及している用語解説の一部を掲載しています。

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