13th International Congress of Historical Sciences.
93%
| Country: | Soviet Union, USSR |
|---|---|
| Issue: | International Congresses and Assemblies |
| Date: | 1970-08-16 |
| Print: | Photogravure |
| Size: | 28 x 40 |
| Perforation: | comb 11½ |
| Emission: | Commemorative |
| Format: | Stamp |
| Face Value: | 4 Russian kopek |
| Print run: | 5000000 |