Great Britain
George V gold Proof 1/2 Sovereign 1911 PR63 NGC, KM819, S-4006.
https://coins.ha.com/itm/great-britain/great-britain-george-v-gold-proof-1-2-sovereign-1911-pr63-ngc-/a/3082-34171.s?type=CoinArchives3082
HID02906262019
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Estimate: 400-500 USD