URSS
Prezentat acum: URSS - Timbre poştale (1923 - 1991) - 1 timbre.
1966
International Mathematics Congress
20. Iulie WM: Niciunul Marimea foii: 50 Design: V. Pimenov Perforare: 11½
![[International Mathematics Congress, Tip DFQ]](https://swmedia-4cd6.kxcdn.com/media/catalogue/USSR/Postage-stamps/DFQ-s.jpg)
