FDC made in the Soviet Union, 1980. The FDC is about the international space flights program (Interkosmos). This time it is about the space flight with Bulgaria. The text reads:”International Space Flights”.
Interkosmos was a Soviet space program, designed to help the Soviet Union’s allies with manned and unmanned space missions.
The program included the allied east European nations of the Warsaw Pact and other socialist nations like Afghanistan, Cuba, Mongolia, and Vietnam. In addition, pro Soviet nations such as India and Syria participated, and even France and Austria, despite them being capitalist nations.