1/2 Real Plata Boliviana

Banco del Rosario was one of several provincial Argentine banks chartered in the 1860s under the national banking law of 1863, which allowed provinces to establish note-issuing institutions backed by government bonds. Santa Fé's banking infrastructure at this period was thin, and fractional denominations like this half-real were a practical necessity in a province where small-change shortages were chronic and copper coin supply unreliable.

The "Plata Boliviana" designation is the telling detail — it pegged the note's value to Bolivian silver rather than to a domestic standard, reflecting how deeply Bolivian coinage had penetrated the interior Argentine currency supply by mid-century.