50 Céntimos La Riera de Gaià

La Riera de Gaià was a village of under a thousand inhabitants when it issued this note during the Spanish Civil War. The Republican zone suffered a catastrophic shortage of small-denomination coinage from 1936 onward — silver and copper had been hoarded or melted — forcing municipalities across Catalonia to print their own emergency fractional currency. Ajuntaments with no banking infrastructure and minimal funds turned to local commercial printers, which is why Imprenta Solé of Tarragona handled issues for multiple small Catalan towns in this period.

At 61 × 33 mm, this is about as small as paper currency gets — closer to a bus ticket than a banknote.