Airmail - The 6th National Engineers' Congress, 1961 and 75th Anniversary of Colombian Society of Engineers 1962
現在展示： 哥倫比亞 - （通用）郵票 - 1962 - Airmail - The 6th National Engineers' Congress, 1961 and 75th Anniversary of Colombian Society of Engineers - 3 郵票.
1962
Airmail - The 6th National Engineers' Congress, 1961 and 75th Anniversary of Colombian Society of Engineers
12. June 窗口管理器: 空缺 設計: Mosdóssy 篩孔: 11½ x 12
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![[Airmail - The 6th National Engineers' Congress, 1961 and 75th Anniversary of Colombian Society of Engineers, 類型 ACO]](https://www.stampworld.com/media/catalogue/Colombia/Postage-stamps/ACO-s.jpg)
![[Airmail - The 6th National Engineers' Congress, 1961 and 75th Anniversary of Colombian Society of Engineers, 類型 ACP]](https://www.stampworld.com/media/catalogue/Colombia/Postage-stamps/ACP-s.jpg)
