USSR
Now showing: USSR - Postage stamps (1923 - 1991) - 1 stamps.
1963
International Correspondence Week
20. September WM: None Sheetsize: 50 Design: Yu. Ryakhovsky Perforation: 11½
![[International Correspondence Week, type COR]](https://swmedia-4cd6.kxcdn.com/media/catalogue/USSR/Postage-stamps/COR-s.jpg)