Brazil
João VI 20 Reis 1821-R AU55 Brown NGC, Rio de Janeiro mint, KM316.1, LMB-508. Toned to a deep mahogany and showing underlying luster throughout.
https://coins.ha.com/itm/brazil/brazil-joao-vi-20-reis-1821-r-au55-brown-ngc-/a/61181-97032.s?type=CoinArchives61181
HID02906262019
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Estimate: 50-100 USD