1 Peso

The Banco y Casa de Moneda de Buenos Aires occupied a peculiar constitutional position in the 1850s — it was simultaneously the provincial bank of Buenos Aires and the de facto central bank of a province that had seceded from the Argentine Confederation and was operating as a fully independent state. The 1853 Constitution created a federal republic, but Buenos Aires refused to join until 1861, leaving this institution issuing currency under its own authority with no federal oversight whatsoever.

PS prefix in the Pick catalogue flags it as a broken bank or obsolete provincial issue. By the time Buenos Aires rejoined the Confederation, the monetary landscape had shifted and these notes were absorbed into successor arrangements rather than formally redeemed at face.