This striking 3¢ commemorative stamp from the United States was issued in 1933 to honor Chicago’s "Century of Progress" Exposition, celebrating the city’s centennial (1833–1933). It features an image of the Federal Building, symbolizing modern architecture and urban growth during the fair. Printed in rich violet-purple, the design reflects the optimism of the era, highlighting America’s progress in science, technology, and industry. A sought-after piece for collectors of U.S. commemoratives and world’s fair issues, it stands as a historical reminder of one of the most important expositions of the 20th century. A key item for thematic collections on architecture, expositions, or American history.