Brazil
João VI 640 Reis 1821-B AU Details (Environmental Damage) NGC, Bahia mint, KM325.3, LMB-460. One of only 7,664 struck. Slightly glossy, with sharp definition in the central features.
https://coins.ha.com/itm/brazil/brazil-joao-vi-640-reis-1821-b-au-details-environmental-damage-ngc-/a/3091-30098.s?type=CoinArchives3091
HID02906262019
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Estimate: 600-800 USD