Brazil
Cuiaba counterstamped 960 Reis 1821 VF (cleaned, holed & plugged, mount removed), KM353. 40mm. 26.65gm. Displaying Type C 960/C (obverse) and Portuguese arms (reverse) counterstamps on a Charles IV 8 Reales 1808 PTS-PJ from Bolivia (cf. KM97). Called "the rarest Brazilian counterstamp" by the SCWC, this elusive issue is sure to come heavily sought-after by collectors of the Brazilian series.
From the Engelen Collection of World Coinage
HID02901242017
Estimate: 400-600 USD