25th anniversary of the Warsaw Pact.
Memorial stone with the coats of arms of the Warsaw Pact countries
The participating countries of the Warsaw Pact as displayed by the coats of arms were: Poland, Soviet Union, Bulgaria, Czechoslovakia, East Germany, Romania and Hungary.
1955-80 Układ Warszawski = 1955-1980 Warsaw Pact.
Find other Polish stamps commemorating Warsaw Pact anniversaries