The 6th International Proletarian Esperanto Congress 1926
Viser nu USSR - Post frimærker - 1926 - The 6th International Proletarian Esperanto Congress - 2 frimærker.
1926
The 6th International Proletarian Esperanto Congress
5. august VM: 1 Arkstørrelse: 80 Design: V. Kupriyanov Gravering: litho Perforeringer: 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)
