Airmail - The 150th Anniversary of the Birth of Heinrich von Stephan (Founder of U.P.U.), 1831-1897 1981
Viser nu El Salvador - Post frimærker - 1981 - Airmail - The 150th Anniversary of the Birth of Heinrich von Stephan (Founder of U.P.U.), 1831-1897 - 2 frimærker.
![[Airmail - The 150th Anniversary of the Birth of Heinrich von Stephan (Founder of U.P.U.), 1831-1897, type SH]](https://www.stampworld.com/media/catalogue/El-Salvador/Postage-stamps/SH-s.jpg)
![[Airmail - The 150th Anniversary of the Birth of Heinrich von Stephan (Founder of U.P.U.), 1831-1897, type SH1]](https://www.stampworld.com/media/catalogue/El-Salvador/Postage-stamps/SH1-s.jpg)
