Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Development of Bulgarian Civil Air |
| Nominal: | 13 ст |
| Year: | 1965 |
| Perforation: | line 10½ |
| Mintage: | 200,000 |
Development of Bulgarian Civil Air
 Junkers Ju52/3 over Weliko Tarnovo 0.03$ |  Iljuschin Il-14M over Plovdiv 0.05$ |  Mi-4 on Dimitrovgrad 0.09$ |  Tupolev 104 on Rousse |
 Ilyushine 18 on Varna |  Tupolev 114 on Sofia 1.6$ |