1/2 Sol Provincias del Rio de la Plata

Potosí's mint had been producing coinage for the Spanish crown for over two centuries when the independence movement forced a sudden change of allegiance. In 1815, royalist forces still controlled the city, yet the mint struck coins in the name of the rebel Provincias del Río de la Plata — a political contradiction explained by the city's repeated capture and recapture during the Argentine War of Independence, which saw Potosí change hands multiple times between 1810 and 1825.

The CJ#18 designation places this half sol within Cunietti-Ferrando's specialized reference on Río de la Plata coinage, which remains the authoritative source for distinguishing the numerous die varieties produced under chaotic wartime minting conditions.