1 1/2 Real Plata Boliviana

The Banco de Londres y Río de la Plata was a British joint-stock bank established in Buenos Aires in 1862, with the Rosario branch opening shortly after as the city grew into a major commercial hub along the Paraná river trade routes. This note predates Argentina's unified national currency by nearly two decades — the peso moneda nacional wasn't introduced until 1881 — meaning provincial and foreign-chartered banks issued their own paper in a patchwork of competing denominations.

The denomination itself is the curiosity here. The real plata boliviana was a unit inherited from the old Spanish colonial system and was already an awkward anachronism by the mid-1860s. Issuing in fractional reales suggests this note was aimed squarely at small retail transactions in a city where coin shortages were chronic.