STAMP ISSUES RELATED TO ICAO (1978-1983)

Sao Tome and Principe : History of aviation and 35^th Anniversary of ICAO

Issue date: 21/12/1979
	Wright Brothers and double-decker Flyer I (1903) ‑ ICAO emblem.
	Vought Sikorsky VS300 (1939) ‑ ICAO emblem.
	Spirit of St. Louis (1927) registered in the experimental category under number N-X-211 in the USA ‑ ICAO emblem.
	Dornier Do‑X (1929) registered D-1929 in Germany ‑ ICAO emblem.
	Santa Cruz Fairey-17 111D ‑ ICAO emblem.
	United States NASA Space Shuttle over earth. Without ICAO logo.
Background: For an unknown reason, the last stamp of this set (value 17db) shows the space shuttle, without ICAO logo.