Great Britain
George IV Proof 1/2 Crown 1826 PR64 NGC, KM695, S-3809. Patinated in battleship-gray tone with an electric undercurrent of iridescence expressed throughout the fields.
https://coins.ha.com/itm/great-britain/great-britain-george-iv-proof-1-2-crown-1826-pr64-ngc-/a/3089-32765.s?type=CoinArchives3089
HID02906262019
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Estimate: 2500-3500 USD