1 Centimo Castellón

Castellfort is a tiny municipality in the Maestrazgo highlands of Castellón province — its 1936 population barely exceeded a few hundred. When the Spanish Civil War severed normal coin supply chains, hundreds of small Republican-zone municipalities issued their own emergency cardboard or paper fractions, a phenomenon the Spanish call billetes locales or cartones moneda. Castellfort's issue is among the most obscure in this category, reflecting a community so small that surviving examples are genuinely rare simply through attrition — few were ever made, fewer still were preserved.