Brazil
Jose I gold 6400 Reis 1752-R AU Details (Saltwater Damage) NGC, Rio de Janeiro mint, KM172.2, LMB-420. Even, matte-like surfaces that are likely the result of having been submerged in a shipwreck for a long period of time.
https://coins.ha.com/itm/brazil/brazil-jose-i-gold-6400-reis-1752-r-au-details-saltwater-damage-ngc-/a/61162-99023.s?type=CoinArchives61162
HID02906262019
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Estimate: 600-700 USD