Ryō
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The ryō was a gold currency unit in the shakkanhō system in pre-Meiji Japan. It was eventually replaced with a system based on the yen.
Keichō-period koban with value of one ryō
Koban (coin)
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The koban was a Japanese oval gold coin, cast on the order of Tokugawa Ieyasu in Edo period feudal Japan and a part of Tokugawa coinage.
Ryō
…shogunate attempted to create a central currency, based on gold, silver and copper units all exchangeable at fixed rates. Oblong gold coins, called koban, were minted with one koban containing about one ryō of gold, so that koban carried a face value of one ryō. The official rate was set in 1609 at one…
Koban
Size evolution of the Koban during the Tokugawa period. From left to right: Keichō koban (1601-1695), Genroku koban (1695-1710), Hōei koban (1710-1714), Shōtoku koban (1714), Kyōhō koban (1714-1736), Genbun koban (1736-1818), Bunsei koban (1819-1828), Tenpō koban (1837-1858), Ansei koban (1859), Man'en koban (1860-1867).