Info| Date | 1980, 22 IV |
|---|---|
| Value | 50 Ct |
| Catalog no. | Mi 2884, BL102 Sc 2776 SG MS2841 Y&T BF95 |
| Topic | Interkosmos Project |
| Occasion | Joined issue with Czechoslovakia, German Dem. Rep., Poland and Soviet Union |
| Description | The Bulgarian stamp was issued on April 22, the other stamps on April 11 or 12, 1980. The Bulgarian sheet doesn't carry 'Polonica elements' like a Polish flag. |
