This commemorative 50 centavos stamp was issued by Mexico in 1949 to mark the 75th anniversary (LXXV Aniversario) of the Universal Postal Union, founded in 1874. Designed in bold modernist style, it features large, vertical “UPU” lettering with the years 1874–1949 prominently inscribed, symbolizing global postal unity. The minimalist purple monochrome design emphasizes strength and continuity in international communication. Printed by Talleres de Impresión de Estampillas y Valores, Mexico, it stands as a fine example of postwar Mexican graphic design celebrating worldwide postal cooperation.