Bulgaria
Now showing: Bulgaria - Postage stamps (1879 - 2024) - 1 stamps.
1977
The 4th Congress of the Inter Parliamentary Union (IPU)
12. September WM: None Perforation: 13¼
![[The 4th Congress of the Inter Parliamentary Union (IPU), type COF]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Bulgaria/Postage-stamps/COF-s.jpg)
