50 Céntimos Quero

Quero is a small municipality in the province of Toledo, Castile–La Mancha. Like hundreds of Spanish towns during the Civil War, its local administration issued fractional emergency currency in 1936–37 to compensate for the near-total disappearance of metallic coinage, which was being hoarded or melted down across the Republican zone. These hyper-local notes were authorized under the chaotic monetary improvisation of the early war period, not by any central banking authority.

The sole security feature — an official stamp — was the only thing distinguishing a valid note from a forgery, and in a village-scale economy, that was probably sufficient.