Statele Unite (SUA)
Prezentat acum: Statele Unite (SUA) - Timbre Par Avion (1918 - 2012) - 2 timbre.
1991
William T.Piper
17. Mai WM: Niciunul Perforare: 11
![[William T.Piper, Tip CW]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CW-s.jpg)
1993
William T. Piper - Hair Touches Top Edge of Design
13. Iulie WM: Niciunul Perforare: 11¼
![[William T. Piper - Hair Touches Top Edge of Design, Tip CW1]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CW1-s.jpg)
