20 Pesos Fuertes

Banco Oxandaburu y Garbino was a private Argentine bank operating out of Gualeguaychú, Entre Ríos — a provincial commercial center whose banking activity in the 1860s reflected the broader experiment with free banking that characterized pre-centralization Argentina. The bank never achieved the scale or longevity of the major Buenos Aires houses, and notes from this issuer are genuinely scarce today, survivors of a short-lived institution rather than a prolific one.

The American Bank Note Company contract is worth noting — ABNC handled numerous South American provincial bank commissions during this period, often using shared plate elements across different clients, which occasionally leads to design similarities across otherwise unrelated issuers.