Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Exploration of Space |
| Nominal: | 40 ст |
| Year: | 1971 |
| Perforation: | comb 12½ |
| Mintage: | 180,000 |
Exploration of Space
 Neil Armstrong on the Moon (Apollo 11) |  Salyut Space Station 0.1$ |  Soyuz 11 |  Soyuz 11 with Saljut 1 |