½ Real Plata Boliviana

The Banco del Río de La Plata was a short-lived private commercial bank operating in Buenos Aires during the 1860s, when Argentina's banking sector was a patchwork of provincial and private institutions each issuing their own paper. The ½ Real denomination is unusually fractional — small-change notes of this kind were typically a response to chronic coin shortages, particularly in smaller silver denominations that were being melted, exported, or hoarded in preference to paper.

The "Plata Boliviana" specification is notable: it anchors the note's value to Bolivian silver coinage rather than the Argentine peso, reflecting just how fragmented and regionally negotiated monetary units were in the Río de la Plata basin at this period.