Anniversaries, designed by Zdenek Filip, engraved by Jan Mracek and Vaclav Fajt (III stamp) and issued by Czechoslovakia on May 5, 1985.
The 40th Anniversary of Prague Uprising (May 1945).
The Prague Uprising was a nationwide revolt launched by the Czech resistance during the final days of World War II. It helped liberate Prague from Nazi occupation shortly before the German surrender.

The 40th anniversary of the liberation of Czechoslovakia by the Soviet army.
In 1945, the Soviet Red Army played the leading role in liberating most of Czechoslovakia from Nazi Germany, bringing an end to six years of occupation.

The 15th anniversary of the Czechoslovak – Soviet Treaty,
Commemorate the 1970 treaty of friendship, cooperation, and mutual assistance between Czechoslovakia and the Soviet Union, symbolizing the close political and economic ties between the two socialist states.

The 30th anniversary of the Warsaw Pact.
The Warsaw Pact, established in 1955, was a military alliance of the Soviet Union and seven Eastern European socialist countries, serving as the Eastern Bloc's counterpart to NATO during the Cold War.
