Great Britain
George VI gold Proof Sovereign 1937 PR66 NGC, KM859, S-4076. Definitively and fully struck to yield complete details over surfaces bearing marked reflectivity. Though not awarded a "cameo" designation by NGC, a hint of golden frost is seen over George's bust, enhancing the contrast against the background.
https://coins.ha.com/itm/great-britain/great-britain-george-vi-gold-proof-sovereign-1937-pr66-ngc-/a/3085-31685.s?type=CoinArchives3085
HID02906262019
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Estimate: 4000-4500 USD