Bakumatsu currency, sometimes called "Aratame sanbu sadame" after its inscription, was legal tender in Japan between 1854 and 1868. This currency featured Japanese stampings on its front and a Mexican eagle on its back. It was fully discontinued in the 1870s with the passage of the National Bank acts.
The Mexican eagle on Bakumatsu currency is a legacy of Japan's troubled economy in the years following its opening in 1854. A discontinuity in gold and silver exchanges led foreign interests to drain the country of its precious metals, and local counterfeiting led to a chaotic system involving multiple currencies. As an attempt at controlling the chaos, the Mexican dollar was briefly adopted as a national currency with its value pegged at 3 Bu.