9th World Congress of Trade Unions.
93%
| Country: | Soviet Union, USSR |
|---|---|
| Issue: | International Congresses and Assemblies |
| Date: | 1978-04-16 |
| Print: | Offset and Lithography |
| Size: | 28 x 40 |
| Perforation: | comb 12¼ x 12 |
| Emission: | Commemorative |
| Format: | Stamp |
| Face Value: | 6 Russian kopek |
| Print run: | 4000000 |