Brazil
João Prince Regent gold "Special Series" 4000 Reis 1816-(R) UNC Details (Cleaned) NGC, Rio de Janeiro mint, KM312, LMB-578. A highly popular one year type bearing João's full title in Latin on the reverse, "PRINCEPS REGENS". Despite its certification, this piece still exhibits frosty mint luster and UNC striking detail.
https://coins.ha.com/itm/brazil/brazil-joao-prince-regent-gold-special-series-4000-reis-1816-r-unc-details-cleaned-ngc-/a/3083-30193.s?type=CoinArchives3083
HID02906262019
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Estimate: 2000-3000 USD