5 Céntimos Roquetes

Roquetes, a small municipality in the Baix Ebre comarca of Tarragona, issued cardboard emergency money during the Spanish Civil War to address a near-total collapse of small-denomination coinage in Republican-held territory. The central Republican government's inability to supply adequate fractional currency forced hundreds of Catalan municipalities to print their own — a phenomenon so widespread that collectors now catalogue thousands of distinct local issues from 1936–1938 alone.

Cardboard wore rapidly in pocket circulation, which is why surviving examples in clean, uncreased condition are genuinely scarce relative to the original print runs.