Cuiaba, Brazil, 960 reis, Joao VI, "960 / .C." counterstamp (1821) on a Potosi, Bolivia, bust 8 reales, Charles IV, 1808 PJ, rare, NGC VF 30, c/s XF standard. Russo-487; KM-350. Fully detailed countermark and host with choice toning all over, parts of rims weak (as made), decent example of a brief and elusive counterstamp.
Estimate: 1000 - 1500 USD