However, Ieyasu used Ryogoku Kahei issued by Shingen TAKEDA as the basis of 'ryo,' the monetary system of koban (former Japanese oval gold coin) in the early period of Edo period, and for this reason, he permitted issue of Koshukin, a successor of the local currency established by Shingen TAKEDA, with the condition that the currency was only to be used within the Kai Province.
が、江戸時代前半には小判の通貨体系としての「両」の基となった、武田信玄による甲斐国の領国貨幣を引き継いだ甲州金に限り領内通用を条件に発行が認められた。