Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Zemen Monastery Frescos |
| Nominal: | 13 ст |
| Year: | 1976 |
| Size: | 37 x 53 mm |
| Perforation: | comb 12 x 12¼ |
| Mintage: | 500,000 |
Zemen Monastery Frescos
 St. Theodore Stratelates 0.1$ |  Apostle Paul |  St. Joachim |  Melchisedek |
 St. Porphyrius |  Queen Doja |  Communion (Detail) |