Sierra Leone
British Colony. Sierra Leone Company bronzed-copper Proof 20 Cents 1791 PR66 PCGS, KM4a, FT-4b. Glossy bronzed surfaces envelop this highly reflective gem Proof representative, one rarely encountered in such pristine conditions. Skillfully engraved and struck low-relief, lending to the unusual shallow appearances of this offering. PCGS notes having certified a total of six bronzed-copper pieces, the current example bested only by a single finer.
https://coins.ha.com/itm/sierra-leone/sierra-leone-british-colony-sierra-leone-company-bronzed-copper-proof-20-cents-1791-pr66-pcgs-/a/3091-32813.s?type=CoinArchives3091
HID02906262019
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Estimate: 1500-1800 USD