A striking Spanish cinderella label issued for the Pro-Seminario fundraising campaign in Zaragoza, featuring the iconic Basilica del Pilar and the Ebro River bridge. The sepia-toned central vignette shows a dramatic aircraft flying above the historic skyline, symbolizing progress and protection. Printed with ornate blue architectural borders and marked “SIN VALOR POSTAL”, this 1-peseta label was never valid for postage but widely used on correspondence as a charity seal. These labels are sought after for their Civil War–era aesthetic, regional themes, and aviation-philately crossover appeal. A fine thematic piece combining religion, architecture, and early aviation.