USSR
Now showing: USSR - Postage stamps (1923 - 1991) - 1 stamps.
1963
The 250th Birth Anniversary of Denis Diderot
10. October WM: None Sheetsize: 50 Design: S. Sokolov Perforation: 11½
![[The 250th Birth Anniversary of Denis Diderot, type COV]](https://swmedia-4cd6.kxcdn.com/media/catalogue/USSR/Postage-stamps/COV-s.jpg)
