What is the value of a coin dated 1821 that says georgius iiii dg britanniar rex fd?

There were several British coins minted in 1821 that match that description.

Sovereign (gold) 22.05 mm in diameter.

Half-Sovereign (gold) 19.3 mm in diameter.

Crown (silver) 37.6 mm in diameter.

Halfcrown (silver) 32 mm in diameter.

Shilling (silver) 23.5 mm in diameter.

Sixpence (silver) 19 mm in diameter.

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