5 Pesos Oro

Colombia's Banco de la República had been printing its mid-denomination notes through Thomas De La Rue for decades by 1960, part of a long-standing arrangement that gave the series a consistency of quality unusual for Latin American issues of the period. The "Pesos Oro" designation — gold pesos — was a legal fiction by this point; Colombia had effectively severed the gold link years earlier, but the unit name persisted in official use until the 1993 currency reform quietly retired it.

The watermark is the sole security feature, modest even by the standards of the day. De La Rue was capable of considerably more sophisticated protection, but the specification reflects what the Banco ordered, not the printer's ceiling.