Great Britain
George VI gold Proof 1/2 Sovereign 1937 PR65 NGC, KM858, S-4077.
https://coins.ha.com/itm/great-britain/great-britain-george-vi-gold-proof-1-2-sovereign-1937-pr65-ngc-/a/3076-34101.s?type=CoinArchives3076
HID02906262019
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Estimate: 800-1000 USD