USSR
Now showing: USSR - Postage stamps (1923 - 1991) - 1 stamps.
1961
The Fifth International Biochemical Congress
31. July WM: None Sheetsize: 25 Design: Yu. Ryakhovsky Perforation: 12¼ x 11¾
![[The Fifth International Biochemical Congress, type CDI]](https://swmedia-4cd6.kxcdn.com/media/catalogue/USSR/Postage-stamps/CDI-s.jpg)
