Issued by Mexico in 1974, this 80-centavos airmail stamp was released to commemorate the Exposición Filatélica Nacional (EXMEX ’73), one of the country’s most important national philatelic exhibitions. The design by G. Gutiérrez features the historic Palacio de Cortés in Cuernavaca—an iconic 16th-century fortress and one of the oldest civil structures in the Americas. Its bold geometric lettering and crisp modernist border reflect the artistic style of Mexico’s 1970s commemorative issues. A desirable thematic item for collectors of exhibitions, architecture, airmail, and Mexican philately.