Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | American-Soviet space company Apollo-Soyuz |
| Nominal: | 28 ст |
| Year: | 1975 |
| Perforation: | comb 13 |
| Mintage: | 250,000 |
American-Soviet space company Apollo-Soyuz
 Alexei Leonov and Soyuz 19 |  Thomas P. Stafford and Apollo 0.26$ |  Apollo, Soyuz |  Connected Apollo-Soyuz |