Great Britain
George IV Proof Shilling 1821 PR64 NGC, KM679, S-3810. Veiled in metallic tone that turns iridescent at a slight angle, steel-blue iridescence caressing George's razor-sharp bust and soft champagne coloration uniformly decorating the legends.
https://coins.ha.com/itm/great-britain/great-britain-george-iv-proof-shilling-1821-pr64-ngc-/a/3089-32757.s?type=CoinArchives3089
HID02906262019
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Estimate: 1500-2000 USD