Brazil
João V gold 6400 Reis 1742-R AU Details (Saltwater Damage) NGC, Rio de Janeiro mint, KM149, LMB-217. A scarcer issue that seldom appears in any condition. Presumably sourced from the wreckage of a ship, with the effects of saltwater and sand causing hairlines and light granularity to the surfaces.
https://coins.ha.com/itm/brazil/brazil-joao-v-gold-6400-reis-1742-r-au-details-saltwater-damage-ngc-/a/61162-99007.s?type=CoinArchives61162
HID02906262019
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Estimate: 600-800 USD