Brazil
João Prince Regent 640 Reis 1811-M AU Details (Cleaned) NGC, Minas Gerais mint, KM256.3, LMB-434. Overstruck on earlier Brazilian 600 Reis of Jose I, with traces of the undertype easily visible to the naked eye. Struck notably off-center, and a highly interesting example of the issue.
https://coins.ha.com/itm/brazil/brazil-joao-prince-regent-640-reis-1811-m-au-details-cleaned-ngc-/a/61181-97052.s?type=CoinArchives61181
HID02906262019
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Estimate: 400-600 USD