Therefore, in order to prevent the downfall of the exchange rate of the sen (a unit of currency), the rate was officially fixed as 6,500 mon per ryo by the furegaki (bakufu orders) announced by the Edo bakufu in September 1842 to be stayed around 6,000 to 7,000 per ryo for a while, however, after the mass production in the end of the Edo period, it finally went over 10,000 mon per ryo in Keio era (1865 to 1868).
そこで幕府は銭相場の下落を防止するため、天保13年8月に御用相場として一両＝6500文の触書を出し、しばらくは一両＝6000～7000文程度で落ち着いたが、幕末期の大量発行に至り慶應年間にはついに一両＝10000文を突破した。