Bank of Japan Institute for Monetary and Economic Studies, Currency Museum, "A History of Japanese Currency," main text.

Claims Supported by This Source

1. The Wadōkaichin in 708, and the Fuhonsen before that.
2. The minting of coins ceased in the 10th century, with the Kengen Taihō of 958 being the last, followed by the use of imported coins until the 16th century.
3. The Keichō gold and silver coins in 1601, and the Kan'ei Tsūhō in 1636.
4. At the time of the opening of the country, the gold-to-silver ratio was approximately 1 g of gold to 5 g of silver in Japan, and 15 g of silver abroad. The pure gold content of the Man'en Koban was reduced to one-third.
5. The New Currency Act of 1871 (yen, sen, rin; 1.5 g of gold = 1 yen).

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