4 Momme 6 Fun Akita

Kubota Domain issued this piece under the emergency monetary pressures of the early 1860s, when the forced opening of Japanese ports to foreign trade destabilized the Tokugawa monetary system almost overnight. Foreign merchants arbitraged gold out of Japan at ruinous rates, and many domains responded by striking their own silver coinage to manage local exchange outside the collapsing national framework. Kubota — the castle town of Akita han — was among them.

The 4 Momme 6 Fun denomination is specific to Akita's own weight standard, not the central Tokugawa system.