The 6th International Proletarian Esperanto Congress 1926
Ora in esposizione: Unione delle Repubbliche Socialiste Sovietiche - Francobolli postali - 1926 - The 6th International Proletarian Esperanto Congress - 2 francobolli.
1926
The 6th International Proletarian Esperanto Congress
5. Agosto WM: 1 Dimensioni del foglio: 80 Disegno: V. Kupriyanov Incisione: litho Dentellatura: 12½
![[The 6th International Proletarian Esperanto Congress, Scrivi U]](https://www.stampworld.com/media/catalogue/USSR/Postage-stamps/U-s.jpg)
![[The 6th International Proletarian Esperanto Congress, Scrivi U1]](https://www.stampworld.com/media/catalogue/USSR/Postage-stamps/U1-s.jpg)
