Now showing: United States - Airmail stamps - 1971 - Winged Airmail Envelope - 2 stamps.
WM: None Perforation: 11 x 10½
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![[Winged Airmail Envelope, type BB]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BB-s.jpg)
![[Winged Airmail Envelope, type BB1]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BB1-s.jpg)
