Description
The port was opened in 1859 (Ansei 6) following the conclusion of the Japan-US Treaty of Peace and Amity.
Requests from foreign envoys to exchange 1-bu silver coins for foreign silver increased rapidly in order to obtain koban coins, and as the 1-bu silver coins in the cities around the trading ports were depleted, the Shogunate was requested to mint more 1-bu silver coins.
Harris proposed that foreign silver be re-minted and issued as 1-minute silver coins, and the Shogunate accepted this idea, and from August 13th of the same year (September 9th of the same year), the use of 1-minute silver coins with the same purity as foreign silver was introduced. has been started. 1859).
The coins issued at this time were called Ansei Ichibu Gin coins, and in contrast to the old Ichibu Gin coins, they were also called New Ichibu Gin coins (New Ichibu Gin coins).
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