Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | International Sample Fair, Plovdiv |
| Nominal: | 2 ст |
| Year: | 1979 |
| Perforation: | comb 13½ x 13 |
| Mintage: | 300,000 |
International Sample Fair, Plovdiv
 Remote Processing System "ESTEL" 0.16$ |  Isotope Measuring Device |  Bulgarian Computer "elka 55" 0.26$ |