La Plata, Bolivia, 8R-sized silver proclamation medal, 1789, encapsulated NGC AU 50. Medina-179; Cayon-155. Obverse with bust of Charles IV with date (1789) below and legend around reading CAROLUS IV HISP / ETIND / R; reverse with OPTIMO * PRINC * PUBLICE * FIDELIT * JURAT around crowned two-headed eagle between pillars and mountains with castles, standard bearing arm and decapitated heads below. Lightly toned. ($350-500)