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The British "spade" Guinea, so called because of the spade shaped shield on the reverse, was minted from 1787 to 1799. They were 24 mm in diameter and weighed 8.4 grams.

The British "spade" Half-Guinea was minted from 1787 to 1800. They were 20 to 21 mm in diameter and weighed 4.2 grams.

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How can you tell the difference between a Guinea and a Half-Guinea coin?

Size is the difference, but the exact diameter would depend greatly on the year, since the diameter varied from time to time. Guinea coins were first minted in 1663 and last minted in 1813. The British Guinea coin had a diameter of 24 to 26 mm. Half-Guinea coins were first minted in 1669 and last minted in 1813. The British Half-Guinea had a diameter of 20 to 21 mm.


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