Radio Waves Connecting Echo I and Earth
56%
| Country: | United States of America |
|---|---|
| Issue: | Echo I -- Communication for Peace Issue |
| Date: | 1960-12-15 |
| Print: | Recess |
| Perforation: | 11 x 10½ |
| Emission: | Commemorative |
| Format: | Stamp |
| Face Value: | 4 United States cent |
| Print run: | 124000000 |