10 Australes

Banco de la Provincia de Buenos Aires is the oldest bank in Argentina, predating the republic itself, but this note belongs to one of the country's more chaotic monetary episodes. The austral replaced the peso argentino in June 1985 under the Austral Plan — an emergency stabilization program launched by the Alfonsín government to arrest hyperinflation that had briefly exceeded 1,000% annually. Provincial banks were authorized to issue their own australes notes in parallel with the central bank.

The plan worked briefly, then collapsed. By 1989 inflation had returned with force, and the austral was eventually abandoned in favor of the convertible peso in 1992.