Brazil
Pedro II gold 10000 Reis 1883 MS64 NGC, Rio de Janeiro mint, KM467, Russo-666. Choice Mint State with essentially full mint bloom and only a few trivial surface contact marks, as expected for the assigned grade. Very scarce in this lofty quality, and a good representative for the issue, with only 9 other coins currently certified higher by NGC for the entire type.
Estimate: 800-1000 USD