The 6th International Proletarian Esperanto Congress 1926
Now showing: USSR - Postage stamps - 1926 - The 6th International Proletarian Esperanto Congress - 2 stamps.
1926
The 6th International Proletarian Esperanto Congress
5. August WM: 1 Sheetsize: 80 Design: V. Kupriyanov Engraving: litho Perforation: 12½
![[The 6th International Proletarian Esperanto Congress, type U]](https://www.stampworld.com/media/catalogue/USSR/Postage-stamps/U-s.jpg)
![[The 6th International Proletarian Esperanto Congress, type U1]](https://www.stampworld.com/media/catalogue/USSR/Postage-stamps/U1-s.jpg)
