Great Britain
George III copper Proof Pattern "Royal Cypher" 6 Pence 1791 PR63 Brown NGC, ESC-1649. Plain edge.
https://coins.ha.com/itm/great-britain/great-britain-george-iii-copper-proof-pattern-royal-cypher-6-pence-1791-pr63-brown-ngc-/a/3082-34022.s?type=CoinArchives3082
HID02906262019
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Estimate: 500-600 USD