Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Founding of the Social Democratic Youth Association |
| Nominal: | 16 ст |
| Year: | 1952 |
| Perforation: | line 10¾ x 11½ |
| Mintage: | 100,000 |
Founding of the Social Democratic Youth Association
 1st Congress of the Association in 1912 |  Revolutionists Fight Scene |  Map of Bulgaria, Industrial Plant and Border Patrol |  G. Dimitrov among the Youth |