SCG3228 - Ryukyus 5½¢ Airmail Stamp – Shureimon Gate & Jet Plane (1960s)This striking 5 airmail stamp from the Ryukyu Islands features a jet aircraft flying above the iconic Shureimon Gate of Shuri Castle in Okinawa. Issued during the U. S. administration of the Ryukyus (post WWII until 1972), the stamp highlights both traditional Ryukyuan architecture and modern aviation. The vibrant blue background and bilingual inscriptions underscore its role in international airmail service. A classic example of mid 20th century