Brazil
Jose I gold 6400 Reis 1753-R MS62 NGC, Rio de Janeiro mint, KM172.2. Very similar to the 1752-R in this sale, and very likely also a Clive of India recovery piece, with somewhat subdued, satiny luster as a result of spending over 200 years submerged in salt water off the coast of South Africa.
Estimate: 1000-1500 USD