BRAZIL: Joao VI, 1818-1822, AR 960 reis, 1820-R, KM-326.1, Gomes-J6.25.11, variety with medal alignment, magnificent large flan (meaning probably a Bolivian host) with long denticles, only traces of undertype visible, attractive original tone, AU, R
A look at the major search engines turned up no examples.
Estimate: 350-450 USD