Brazil
João VI 960 Reis 1820-R AU Details (Cleaned) NGC, Rio de Janeiro mint, KM326.1, LMB-478. Overstruck on an 1817 Chilean Volcano Peso, the mint name boldly expressed in the undertype to the upper area of the obverse.
https://coins.ha.com/itm/brazil/brazil-joao-vi-960-reis-1820-r-au-details-cleaned-ngc-/a/61181-97072.s?type=CoinArchives61181
HID02906262019
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Estimate: 200-300 USD