Hello again, another from Canada which I hope you like.  This issued in 1955 to commemorate the 10th Anniversary of ICAO, the International Civil Aviation Organisation.

SG 480 and VFU catalogue is only 20p.  This copy is not used but has no gum as I found it with a group of stamps stuck together, Oh well still nice to have in my aviation themed collection.

ICAO is a specialised agency of the United Nations. It codifies the principles and techniques of international air navigation and fosters the planning and development of international air transport to ensure safe and orderly growth. Its headquarters are located in Montreal. .

The ICAO Council adopts standards and recommended practices concerning air navigation, its infrastructure,flight inspection, prevention of unlawful interference, and facilitation of border-crossing procedures for international civil aviation. ICAO defines the protocols for for air accident investigation followed by transport safety authorities in countries signatory to the Convention on International Civil Aviation ( the Chicago Convention). 

enjoy your collecting...... and learning from this wonderful hobby :-)  

Michael