Great Britain, 1 dollar, oval George III countermark (1797-99) on a Potosi, Bolivia, bust 8 reales, Charles IV, 1794PR, NGC MS 62. Sp-3765A; KM-626. Choice deep countermark on lustrous host with very light toning (colorful on reverse), minimal marks, in fact tied with one other for finest known in the NGC census, popular issue (rare in Mint State). NGC #4254443-020.
Estimate: $1500-2250