Brazil
Maria I gold "Bejeweled Headdress" 6400 Reis 1789-R AU Details (Saltwater Damage) NGC, Rio de Janeiro mint, KM226.1, LMB-527. A richly patinated example showing only minimal circulation wear. AGW 0.4229 oz.
https://coins.ha.com/itm/brazil/brazil-maria-i-gold-bejeweled-headdress-6400-reis-1789-r-au-details-saltwater-damage-ngc-/a/61181-97030.s?type=CoinArchives61181
HID02906262019
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Estimate: 700-800 USD