Brazil
Maria I and Pedro III gold 6400 Reis 1780-R AU58 NGC, Rio de Janeiro mint, KM199.2. A bright and flashy sun-yellow, with a touch of friction to the high points.
https://coins.ha.com/itm/brazil/brazil-maria-i-and-pedro-iii-gold-6400-reis-1780-r-au58-ngc-/a/61162-99046.s?type=CoinArchives61162
HID02906262019
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Estimate: 700-900 USD