ASV
Rāda: ASV - Aviopasts Markas (1918 - 2012) - 2 marka.
1991
William T.Piper
17. maijs SV: Neviens Perforēšana: 11
![[William T.Piper, veids 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. jūlijs SV: Neviens Perforēšana: 11¼
![[William T. Piper - Hair Touches Top Edge of Design, veids CW1]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CW1-s.jpg)
