Brazil
Alfonso VI Counterstamped 100 Reis ND (1663) VF25 NGC, KM42, LMB-51, Gomes-41.05. Type IV crowned "100" countermark (VF Standard), struck on a Portuguese João IV 80 Reis from the Evora mint. A well-circulated example of this type, both the counterstamp and host coin having seen significant use in commerce.
https://coins.ha.com/itm/brazil/brazil-alfonso-vi-counterstamped-100-reis-nd-1663-vf25-ngc-/a/3091-30004.s?type=CoinArchives3091
HID02906262019
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Estimate: 200-300 USD