USA
Viser nu USA - Luftpostfrimærker (1918 - 2012) - 1 frimærker.
1985
Aviation Pioneers - Lawrence and Elmer Sperry
13. februar VM: Ingen Design: H. Coslo. Gravering: Bureau of Engraving & Printing. Perforeringer: 11
![[Aviation Pioneers - Lawrence and Elmer Sperry, type CI]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CI-s.jpg)
