Brazil
Maria I gold 6400 Reis 1798-R UNC Details (Obverse Cleaned) NGC, Rio de Janeiro mint, KM226.1, LMB-536. Centrally struck and preserving watery brilliance across the fields. AGW 0.4229 oz.
https://coins.ha.com/itm/brazil/brazil-maria-i-gold-6400-reis-1798-r-unc-details-obverse-cleaned-ngc-/a/3091-30347.s?type=CoinArchives3091
HID02906262019
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Estimate: 700-900 USD