Brazil
João Prince Regent gold 6400 Reis 1810/09-R MS60 NGC, Rio de Janeiro mint, KM236.1, cf. LMB-560. A sun gold example of this LMB-unlisted overdate variety. Interestingly it seems that a fair amount of "scratching out" occurred over the last three digits of the date on the die, leading one to wonder whether this was a crude attempt at covering up a small engraving error of some sort.
HID02901242017
Estimate: 700-1000 USD