This striking United Arab Republic (Egypt) 90m airmail stamp features the historic Mosque of Ibn Tulun in Cairo, rendered in a deep reddish-brown photogravure. Above the ancient complex, a silhouetted aircraft symbolizes the modernity and reach of Egypt’s postal aviation during the UAR era (1958–1961, with Egypt continuing to use the name until 1971). The combination of heritage architecture and aviation makes this issue especially appealing to airmail, architectural, and Middle East thematic collectors. Typically issued perforated and printed by the Egyptian Postal Authority, it remains a popular mid-20th-century UAR airmail definitive.