Bulgaria
Stamp from block
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Conf. on Security and Cooperation in Europe |
| Nominal: | 50 ст |
| Year: | 1986 |
| Perforation: | comb 12¾ x 13 |
Conf. on Security and Cooperation in Europe
 Conference Building (Finlandia Hall), Helsinki |  Map of Europe |  Austria Center Vienna 2.6$ |  Hofburg Vienna |
 Town Hall, Vienna |  UN Building in the Danube Park, Vienna |