To mark the 20th anniversary of the signing of the Treaty of friendship, mutual assistance and postwar cooperation between the USSR and Czechoslovakia (12.12.1943).
State coats of arms and flags of the USSR and Czechoslovakia. Moscow (The Kremlin), Prague (Hradcany).
Flag of Czechoslovakia reversed as in the famous Marche 1958 Vasily Zavyalov "Meeting of Ministers of communications of socialist countries in Moscow"?