Issued in 1961, this 40-centavo commemorative stamp from Mexico honors the 25th anniversary of the Instituto Politécnico Nacional (National Polytechnic Institute). The design captures Mexico’s spirit of technical progress, depicting an engineer at a drafting table and a surveyor working in the field — symbols of applied science and education. The background features industrial and infrastructural imagery, emphasizing the institute’s role in national development. Printed by Talleres de Impresión de Estampillas y Valores de México, it stands as a proud tribute to education and modernization.