Airmail - The 4th National Engineers` Congress, San Salvador 1978
现在展示： 萨尔瓦多 - （通用）邮票 - 1978 - Airmail - The 4th National Engineers` Congress, San Salvador - 1 邮票.
现在展示： 萨尔瓦多 - （通用）邮票 - 1978 - Airmail - The 4th National Engineers` Congress, San Salvador - 1 邮票.
![[Airmail - The 4th National Engineers` Congress, San Salvador, 类型 PX1]](https://www.stampworld.com/media/catalogue/El-Salvador/Postage-stamps/PX1-s.jpg)
