Issued by Spain in 1966, this striking commemorative marks the XVII Congress of the International Astronautical Federation (IAF) held in Madrid. The design creatively blends classical imagery—a mounted knight—with futuristic space-age elements, symbolizing humanity’s transition from historical exploration to cosmic discovery. The dynamic composition, with a stylized horse soaring through a star-filled backdrop, reflects the optimism of the early space era. Printed in rich tones with strong contrast, this stamp is a standout thematic piece for both space and symbolic art collectors. Its unique fusion of tradition and futurism makes it highly desirable in topical collections.