In 1737, it was planned to increase the production of coins in response to sharp increase in the market price of currency to 2,800 mon per ryo due to issuance of Genbun Koban (oval gold coin issued in the Genbun era) and Genbun Chogin (oval silver coin issued in the Genbun era) whose quality levels were deteriorated in 1736, and these coins came to be marked with letters indicating a place of minting on the reverse side.
元文2年（1737年）には前年（1736年）の品位を低下させた元文小判元文丁銀の発行により、銭相場が一両＝2800文前後まで急騰したのを受け銭貨の増産が図られ、これらの銭貨の背面には鋳造地を示す文字が鋳込まれるようになる。