Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | History of aircraft |
| Nominal: | 25 ст |
| Year: | 1981 |
| Perforation: | comb 12½ x 12 |
| Mintage: | 500,000 |
History of aircraft
 Biplane DWV U-1 0.12$ |  Sport aircraft LAS-7 0.12$ |  Airplane LAZ-8 |  Airplane DAR-1 0.21$ |
 Airplane DAR-3 0.31$ |  Airplane DAR-9 2.8$ |