Point of Information
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There is such a thing as a Guinea coin, minted from 1663 to 1814, containing about 1/4oz of gold.
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From
https://www.lbma.org.uk/wonders-of-g...the-royal-mintThe guinea initially had a nominal value of 20 shillings but its actual value fluctuated, sometimes dramatically, until finally being set in stone by
Sir Isaac Newton the Master of the Mint, in 1717, at 21 shillings. This was the equivalent of a fine gold price of £4.4s.11½d per troy ounce, a price that would survive for the next 200 years.
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