100 Reales de Vellón Banco de España

The Banco de España was only formally constituted in 1856, the same year this note was issued — created by the merger of the Banco Español de San Fernando with the Banco de Isabel II under new enabling legislation. This is effectively first-year paper from an institution that had just been granted a monopoly over note issue in Madrid.

Reales de vellón as a unit were already living on borrowed time. Spain decimalized fully in 1868, replacing the real with the peseta, which makes notes denominated this way a narrow window — issued under one monetary system, obsolete within a decade.