Brazil
João Prince Regent gold 6400 Reis 1806-R MS61 NGC, Rio de Janeiro mint, KM236.1, LMB-O556. The obverse die was aligned slightly off-center, and weaker dentilation appears between 2 and 4 o'clock as a result, but the appearance is otherwise perfect for the grade, with bright surfaces and no individually bothersome marks.
Estimate: 900-1300 USD