Bulgaria 1994 Europe Series - Discoveries and Inventions
From Stamps of the World
- Issue Date: 29 April 1994
- Designed by: K. Konstantinova
- Print Run : 1,000,000 each
- Print Process:
- Perforations: 14 x 13¾
- Stamp Size :
- Bulgarian Catalog Numbers : 4133/34
- Michel Catalog Numbers : 4121/22
