What is the Japanese currency that has an eagle on it called?

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.