50 Pesos

Banco Unión was a Colombian regional bank operating under the 1880s free banking legislation that briefly allowed private institutions to issue their own currency. By 1899, that system was already under pressure — the Thousand Days War broke out that same year, and the fiscal chaos that followed accelerated the eventual nationalization of note-issuing rights under the Banco de la República in 1923.

ABNC handled a substantial portion of Latin American private bank printing in this period, and their Colombian contracts were numerous enough that the plates for many regional issuers share compositional elements. Whether this specific note circulated before the war's disruptions curtailed Banco Unión's operations is an open question; surviving examples are uncommon.