1 Peso

Banco de la Unión was one of several private Colombian banks chartered under the 1880 banking law, which allowed provincial commercial banks to issue their own circulating notes. The American Bank Note Company handled a significant share of this work — not because Colombian institutions had any particular loyalty to New York printers, but because ABNC was aggressively marketing its services across Latin America during this period and could offer security printing that local facilities simply couldn't match.

The Banco de la Unión itself was short-lived. Colombia's chaotic monetary history of the 1880s and the eventual nationalization pressures of the following decade pushed most private issuing banks into dissolution, making surviving notes from this series genuinely uncommon in any grade.