Bulgaria : 40th Anniversary of ICAO


Issue date: 25/12/1984



TupolevTu-154B-2 of Balkan Air and ICAO emblem.

The text at the bottom margin of the full sheet of 20 stamps is interesting and shows two errors. The beginning of the text reads as follows: Commemorative stamp 40 years of the International civil airline organization The text after that refers to the price, the printing process and the related authorization.

1.      Although the stamp designates correctly (in Bulgarian) the International Civil Aviation Organization, the margin uses the word airline (in singular form) instead of aviation.

2.     The second error comes from the Cyrillic acronym of the Organization (which should be ). The letter A is missing in the acronym.