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Guinea - British coin - was created in 1663.
Please check your coin.
The last British Guinea or any of the fractional Guinea coins was issued in 1813.
The British Guinea was a gold coin valued at 21 Shillings which was last minted in 1813.
British Guineas were no longer minted after 1813. They were replaced by the Sovereign.
A Guinea is a coin of the old pre-decimal British currency. It was worth approximately 21 shillings.