Now showing: United States - Airmail stamps (1918 - 2012) - 1 stamps.
14. May WM: None Perforation: 11
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![[Avaition Pioneers - Samuel Pierpont Langley, 1834-1906, type CM]](https://swmedia-4cd6.kxcdn.com/media/catalogue/United-States/Airmail-stamps/CM-s.jpg)
