Bulgaria
Imprint blue
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Definitives with Imprint of an Aircraft |
| Nominal: | 4 лв |
| Year: | 1927 |
| Perforation: | comb 11½ |
| Mintage: | 50,000 |
Definitives with Imprint of an Aircraft
 Airplane overprint |  Airplane overprint |  Airplane overprint 0.47$ |  Airplane overprint |