Brazil
Maria I gold 6400 Reis 1788-R UNC Details (Cleaned) NGC, Rio de Janeiro mint, KM218.1, LMB-505. Hairlined throughout, though enhanced by an admittedly exacting strike that sharpens the central features.
https://coins.ha.com/itm/brazil/brazil-maria-i-gold-6400-reis-1788-r-unc-details-cleaned-ngc-/a/3091-30331.s?type=CoinArchives3091
HID02906262019
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Estimate: 800-1000 USD