Great Britain
George IV copper Off-Metal Proof Pattern 1/2 Crown 1824 PR66 Brown NGC, ESC-2369 (prev. ESC-638). None its superior or even equal in NGC's database, an exceptional off-metal Proof for Wyon's first Halfcrown of George IV. Almost impossibly sleek surfaces with an exquisite strike, its color a dark mahogany yet with vibrant flashy white luster when tilted in the light; scattered verdigris spots serve as the sole detraction for this otherwise outstanding premium gem.
https://coins.ha.com/itm/great-britain/great-britain-george-iv-copper-off-metal-proof-pattern-1-2-crown-1824-pr66-brown-ngc-/a/3081-30776.s?type=CoinArchives3081
HID02906262019
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Estimate: 4000-4500 USD