50 Céntimos Vallibona

Vallibona is a village in the Ports comarca of Castellón — its 1937 population was under 300 people. Like dozens of similarly isolated Republican municipalities during the Civil War, the local council issued its own fractional emergency currency when the peseta coinage supply collapsed entirely. The Banco de España had suspended silver and bronze coin production, and the central government's cardboard selos habilitados weren't reaching everywhere.

The validation stamp is the only security measure — entirely typical for this class of issue, where the council's rubber stamp was the sole thing distinguishing legal tender from blank paper.