50 Pesos

The Banco Nacional de las Provincias Unidas del Río de la Plata was established in 1826 under Bernardino Rivadavia's short-lived reform program, and its notes were intended to finance a unified national state that never fully materialized. When Rivadavia fell from power in 1827 and the unitarian project collapsed, the bank continued operating under provincial authority in Buenos Aires — a significant institutional demotion reflected in the increasingly local character of its later issues.

By 1834 the bank was on borrowed time, liquidated the following year under the Rosas administration. Notes from this terminal period were printed locally rather than commissioned abroad, which accounts for the comparatively crude typography found across the PS#373 series.