50 Pesos

Banco Nacional was Argentina's first chartered national bank, established in 1826 under Bernardino Rivadavia's reform program. It lasted barely six years — the bank collapsed in 1836 under the weight of unsecured note issuance and the fiscal pressures of the 1826–1828 war with Brazil, leaving its paper currency largely unredeemed.

PS357 is among the earlier high-denomination emissions from this institution. Notes printed in Buenos Aires during this period were produced under genuinely difficult conditions — skilled engravers and adequate press equipment were chronically scarce in the Río de la Plata region, and the quality of domestic printing reflected those limitations.