Great Britain
George IV Proof Penny 1826 PR65 Brown NGC, KM693, S-3823. From a fleeting three-year series, this razor-sharp gem displays reflective, mahogany-brown surfaces brightened by a subtle amount of copper, likely the result of the bronzing process. An absolute gem, and rarely available as such.
https://coins.ha.com/itm/great-britain/great-britain-george-iv-proof-penny-1826-pr65-brown-ngc-/a/3085-31624.s?type=CoinArchives3085
HID02906262019
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Estimate: 1000-1400 USD