0.50 Pesetas Olèstria

Olèstria — the Catalan name for the municipality of Olius, in the comarca of Solsonès — issued emergency fractional currency during the Spanish Civil War, when the Republican government's inability to maintain a supply of small coins created a vacuum filled by thousands of local ayuntamientos across Catalonia. The Generalitat authorized this practice in 1936, and by 1937 even villages of a few hundred inhabitants were producing their own paper fractions.

Turró's catalog remains the definitive reference for these Catalan municipals, and a listing at #1684 places this squarely in the documented — if thinly circulated — provincial issues.