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koban

小判　—　Names of money

The oval gold coin of Japan.

Keichō koban (oval gold piece) Keichō koban (oval gold piece)AD 1601 Keichō koban Keichō kobanAD 1601–1695 Genroku koban Genroku kobanAD 1695–1710
A photograph of the real thing this term names.

⚠ It was reminted many times, and its composition changed on each occasion. Even though it was always called a "koban," the amount of gold varied greatly depending on the period. This serves as a good exercise in learning not to be deceived by a consistent name.