The 100th Anniversary of the International Metric Convention 1975
Now showing: Bulgaria - Postage stamps - 1975 - The 100th Anniversary of the International Metric Convention - 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://www.stampworld.com/media/catalogue/Bulgaria/Postage-stamps/CEP-s.jpg)