1 Colón Silver certificate, 'en moneda acuñada de plata'

Costa Rica's Administración de Rentas Públicas occupied an unusual position in the country's monetary structure — this was not a central bank or commercial institution but a government revenue administration pressed into note-issuing service during a period when the country lacked a unified banking authority capable of managing wartime currency demands. The phrase "en moneda acuñada de plata" carried legal weight: these certificates were explicitly redeemable in minted silver coin, a guarantee the government was under real pressure to honor as silver coinage grew increasingly scarce across Central America during 1917–1918.

ABNCo printed the series in New York. The engraving quality is characteristic of their Latin American government work from this period — competent, conservative, nothing experimental.