This colorful 1966 airmail stamp from Mexico commemorates the 20th anniversary of the founding of UNESCO (1946–1966). The design prominently features the UNESCO emblem along with a modern geometric block layout in red, green, yellow, and white, symbolizing international cooperation and cultural diversity. Issued with the inscription “AEREO MEXICO”, the stamp was intended for airmail usage. Designed by A. Rojas, it reflects the bold graphic style common in mid-1960s Mexican philatelic issues. The stamp celebrates UNESCO’s mission of promoting education, science, and cultural heritage worldwide.