Brazil
João Prince Regent gold 6400 Reis 1806-R UNC Details (Cleaned) NGC, Rio de Janeiro mint, KM236.1.
From the Dresden Collection
https://coins.ha.com/itm/brazil/brazil-joao-prince-regent-gold-6400-reis-1806-r-unc-details-cleaned-ngc-/a/3076-33411.s?type=CoinArchives3076
HID02906262019
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Estimate: 600-700 USD