USSR
Now showing: USSR - Postage stamps (1923 - 1991) - 1 stamps.
1927
First International Airmail Congress
1. September WM: None Sheetsize: 80 Design: O. Amosova Engraving: litho Perforation: 12½ x 12
![[First International Airmail Congress, type Z]](https://swmedia-4cd6.kxcdn.com/media/catalogue/USSR/Postage-stamps/Z-s.jpg)
![[First International Airmail Congress, type Z1]](https://swmedia-4cd6.kxcdn.com/media/catalogue/USSR/Postage-stamps/Z1-s.jpg)
