What is the diameter of the coin, not counting the mount? If it is 20mm then it is a farthing. Old head farthings were issued 1895 to 1901, but were darkened from 1897.
Whatever the diameter or reverse, the coin is at best a replica - it does not match any genuine coin in design - the detail is too clunky. Probably what is politely called a "jewellers copy" of a sovereign or half sovereign - used for cheap pendants and rings to resemble a gold coin.
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