Bulgaria
Now showing: Bulgaria - Postage stamps (1879 - 2024) - 1 stamps.
1975
The 100th Anniversary of the International Metric Convention
21. March WM: None Perforation: 13
![[The 100th Anniversary of the International Metric Convention, type CEP]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Bulgaria/Postage-stamps/CEP-s.jpg)