100 Pesos

El Banco Nacional was Argentina's first true national bank, chartered in 1826 under Bernardino Rivadavia's reform government with significant backing from Baring Brothers. It lasted barely six years — the bank collapsed in 1836 under the weight of the Rosas-era political upheaval and chronic over-issuance, with its notes ultimately rendered worthless. Issues from the founding year are the earliest in the bank's series and were produced locally in Buenos Aires at a time when domestic printing infrastructure was rudimentary at best.

Surviving examples from 1826 are exceptionally rare.