Moreover, since a large amount of one-mon coins was minted at zeniza in Kameido, Edo from 1765 under the supervision of kinza (an organization in charge of casting and appraising of gold during the Edo period), at zeniza in Fushimi, Kyoto from 1767, and at zeniza in Ishinomaki of Sendai (coin marked with a letter of '千'), Hitachiota City, Hitachi Province (coin marked with a letter or letters of '久' or '久二') and so on from 1768, the market price of currency fell and dropped to about 6,000 mon per ryo in around 1778.
さらに明和2年（1765年）から金座監督の下、江戸亀戸、明和4年（1767年）から京都伏見、明和5年（1768年）からは仙台石巻（「千」字）、常陸国常陸太田市（「久、久二」字）などの銭座で鉄一文銭が大量に鋳造され、銭相場は下落し安永7年（1778年）頃には一両＝6000文前後を付けるに至った。