8 Soles Provincias del Rio de la Plata

Potosí's mint, operating at over 4,000 meters altitude in what is now Bolivia, had been striking silver coinage for the Spanish crown since 1574. By 1815 the independence struggle had fractured control of the region repeatedly — royalist and patriot forces traded the city multiple times between 1810 and 1815 alone, meaning the political authority behind any given issue from this period could shift with the next military campaign.

The Rio de la Plata provincial issues from Potosí are notable for their inconsistent alloy, a consequence of disrupted refining operations during the wars. Assayer marks on individual specimens often allow attribution to specific short production windows.