Old British coin last minted in 1813 (6)

I believe the answer is:

guinea

(Other definitions for guinea that I've seen before include "Old unit of sterling worth 21 shillings" , "Obsolete gold coin" , "Coastal region in West Africa, equal to 21 shillings" , "Former gold coin" , "Old money and pig" .)

I've seen this clue in The Sun.

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