Kolumbien
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1962
Airmail - The 6th National Engineers' Congress, 1961 and 75th Anniversary of Colombian Society of Engineers
12. Juni Wz: Keine Design: Mosdóssy Zähnung: 11½ x 12
![[Airmail - The 6th National Engineers' Congress, 1961 and 75th Anniversary of Colombian Society of Engineers, Typ ACN]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Colombia/Postage-stamps/ACN-s.jpg)
![[Airmail - The 6th National Engineers' Congress, 1961 and 75th Anniversary of Colombian Society of Engineers, Typ ACO]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Colombia/Postage-stamps/ACO-s.jpg)
![[Airmail - The 6th National Engineers' Congress, 1961 and 75th Anniversary of Colombian Society of Engineers, Typ ACP]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Colombia/Postage-stamps/ACP-s.jpg)
