5.000 Pesos

El Estado de Buenos Ayres existed as a politically separate entity from the Argentine Confederation between 1852 and 1861, following Urquiza's defeat of Rosas at Caseros and the subsequent refusal of Buenos Aires province to ratify the Santa Fe constitution. This note was issued under that breakaway provincial government, which maintained its own treasury, customs revenues, and paper money system entirely independent of the Confederation's finances based in Paraná.

The PS prefix in the Pick catalogue signals this is classified as a private or semi-official issue — appropriate given the contested legitimacy of the issuing authority at the time. Surviving examples from this short-lived series are genuinely uncommon.