Guinea gold coin - Guinea

Japanese: ギニー金貨 - ギニーきんか（英語表記）Guinea

The name of an old British gold coin minted from 1663 to 1813. It is approximately 25 mm in diameter, weighs approximately 8.5 g, and has a fineness of 916.6/1000. In Britain, which had been plagued by the outflow of currency due to fluctuations in the international gold-silver ratio, the prevalence of counterfeit currency due to clipping of the edges of coins, and a decline in the value of currency, this gold coin was issued by Charles II as a preventive measure against these problems. Its current value was initially equivalent to a 20 shilling silver coin, but temporarily rose to 30 shillings, and was fixed at 21 shillings in 1717.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

1663年から1813年まで製造されたイギリス旧金貨の名称。直径約25mm，重量約8.5g，品位916.6/1000。国際金銀比価の変動による貨幣の流出と，貨幣の縁の削取り(クリッピング)による悪貨の横行，貨幣価値の下落に悩まされてきたイギリスで，これらの防止策としてチャールズ2世が発行した時価(市場金銀比価)通用の金貨である。通用価値は，当初銀貨20シリングと等価であったが，一時30シリングになり，1717年から21シリングに固定された。

出典　株式会社平凡社世界大百科事典第２版について　情報

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