Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Illuminated initials old Bulgarian manuscripts |
| Nominal: | 13 ст |
| Year: | 1975 |
| Size: | 38 x 38 mm |
| Perforation: | comb 11½ |
| Mintage: | 500,000 |
Illuminated initials old Bulgarian manuscripts
 Protopopinski-Damascus Document 0.04$ |  "B" from 17th cent. Prayerbook 0.11$ |  Buchovsko Gospel |  Oravoslavov Collection |
 Dobjeschevo Gospel |  Eminski-Apostles |