Bulgaria
5.5 - 6.6$
price on 10.03.2023
Centre stamp is imperforate top and bottom.
| Country: | Bulgaria |
| Type: | Postal blocks |
| Series: | Conf. of the signing of the Helsinki Final Act |
| Nominal: | 3*50 ст |
| Year: | 1985 |
| Size: | 172 x 125 mm |
| Perforation: | frame 13 |
| Mintage: | 32,000 |