| Added by |
 Iordache Gabriel
|
| General Description : | Design illustrates maximum sun-spot activity. Series: International Quiet Sun Years and Space Research. |
| Face value | 20 h - Czechoslovak haléř |
| Catalog code (Michel) | CS 1515 |
| Catalog code | Stamp Number CS 1289; Yvert et Tellier CS 1381; Stanley Gibbons CS 1466; AFA number CS 1360; POFIS CS 1421 |
| Series | Anii Internaționali ai Soarelui liniștit și Cercetarea Spațială - Cehoslovacia 1965 |
| Place in series | 1 |
| Stamp colour | Bright violet | Carmine |
| Stamp use | Commemorative stamp |
| Print run | 4.100.000 |
| Issue date | 15/03/1965 |
| Paper type | Stamp |
| Print technique | Photogravure and Recess |
| Perforation | comb 11¾ x 11¼ |
| Height | 44.00 mm |
| Width | 27.00 mm |
| Catalog prices | No catalog prices set yet |
