½ Real Plata Boliviana

Banco Argentino operated out of Paraná, Entre Ríos, during the period when Argentine provincial banks still held significant note-issuing authority before the national consolidation of banking powers in the 1880s. The denomination in Reales Plata Boliviana is telling — Bolivia's silver coinage remained a common circulating medium in the Río de la Plata interior long after Argentine national currency had nominally standardized, and issuers in the Mesopotamian provinces routinely denominated notes against it for practical commercial reasons.

The blank decade digit in the date suggests the plates served across multiple years. PS#1491 is among the more obscure entries in the South American provincial series.