The 6th International Proletarian Esperanto Congress 1926
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1926
The 6th International Proletarian Esperanto Congress
5. augusti WM: 1 storlek på arket: 80 Design: V. Kupriyanov Gravyr: litho Perforering: 12½
![[The 6th International Proletarian Esperanto Congress, Typ U]](https://www.stampworld.com/media/catalogue/USSR/Postage-stamps/U-s.jpg)
![[The 6th International Proletarian Esperanto Congress, Typ U1]](https://www.stampworld.com/media/catalogue/USSR/Postage-stamps/U1-s.jpg)
