20 Pesos

The Banco Nacional de las Provincias Unidas del Río de la Plata was a short-lived institution, founded in 1826 and liquidated by 1836 after chronic political interference and the financial strain of the war with Brazil made its position untenable. Notes from the 1829 period were printed locally in Buenos Aires at a time when the bank had already lost public confidence — runs on its reserves were not uncommon, and convertibility had been suspended.

Locally produced paper currency from this period is technically rudimentary compared to contemporary European-printed issues from neighboring states. The PS# prefix in the Pick catalogue indicates private or quasi-official bank status rather than a central government obligation.