The bakufu tried to specify the location of mintage by making letters indicating the location of mintage cast on the back side of coins and by making letters on coins different according to the location of mintage, for the purpose of maintaining the quality of coins and strengthening copper regulation, which was in urgent demand.
このとき幕府は銭貨の質の管理および、需要が逼迫していた銅の統制を強めていた関係上から、銭の背面に鋳造地を示す文字を鋳出させたり、また面文に特徴を持たせて鋳銭地の明確化を図った。