1000 Australes

The Austral was introduced in June 1985 as part of the Austral Plan, an attempt by the Alfonsín government to halt hyperinflation by replacing the Peso Argentino at a rate of 1 Austral to 1,000 Pesos. It briefly worked. By 1989 it had catastrophically failed — inflation that year exceeded 3,000%, forcing denominations upward until 10,000 and 500,000 Austral notes became necessary. The 1,000 Austral, once a substantial sum, was rendered near-worthless within months of issue.

The Austral itself was retired in 1992, replaced by the Convertible Peso at 10,000 Australes to 1 Peso — meaning this note's entire series lost eleven zeros against the dollar in under a decade.