100 Reales de Vellón Banco de Cádiz

The Banco de Cádiz was one of Spain's provincial banks of issue authorized under the 1856 banking law, which briefly allowed regional institutions to circulate their own notes before the Banco de España gradually absorbed that privilege in the 1870s and extinguished it entirely in 1874. Cádiz, as a major Atlantic port, had the commercial volume to justify a local bank, but the provincial series never achieved wide territorial reach — notes circulated primarily within the issuing province.

The reales de vellón denomination places this firmly in the pre-peseta monetary system, discontinued when Spain decimalized in 1868. A note dated 1861 would have had only seven years of legal life before its unit of account ceased to exist.