50 Céntimos Sena

Sena is a small municipality in the Huesca province of Aragon, and like dozens of Spanish towns it issued emergency fractional paper money during the Civil War after metallic coin vanished from circulation almost immediately in 1936. These hyper-local municipal notes — often called billetes locales or cartones — were produced under wildly inconsistent conditions, sometimes handwritten or rubber-stamped on whatever stock was available. A 40 × 40 mm format suggests something closer to a ticket or chit than a conventional banknote.