2½ Pesos Oro Acuñado

The Casa de Moneda de Medellín was a regional mint, not a central bank, and its decision to issue paper currency denominated in pesos oro acuñado — coined gold pesos — reflects the fractured monetary infrastructure of early twentieth-century Colombia, where regional and departmental institutions occasionally stepped in to cover local liquidity shortfalls. The denomination itself was a direct peg to gold coin, an attempt to anchor public confidence in paper during a period when Colombia's monetary credibility was still recovering from the catastrophic paper inflation of the Thousand Days War.

ABNC's involvement is unsurprising — they held most of the Latin American security printing market at this time — but the combination of a mint issuing fiduciary notes rather than striking coin is genuinely unusual.