Now showing: USSR - Postage stamps - 1927 - First International Airmail Congress - 2 stamps.
1. September WM: None Sheetsize: 80 Design: O. Amosova Engraving: litho Perforation: 12½ x 12
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![[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)
