Bulgaria
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | UNESCO, 25th Anniversary |
| Nominal: | 20 ст |
| Year: | 1971 |
| Perforation: | line 12½ |
| Mintage: | 120,000 |
UNESCO, 25th Anniversary
 Unesco 0.21$ |  UNESCO in the form of Temple, Laurel Wreath |