Stamp Day
Czechoslovakia 1974 - BRNO 74 National Stamp Exhibition
1987 Stamp Day - The 105th Anniversary of the Birth of Jakub Obrovsky ,Stamp Designer
poland 1973 - International Philatelic Exhibition Polska '73 in Poznan
poland 1978 -International Philatelic Exhibition "Capex '78" in Toronto, Canada
Poland 1987 - International Philatelic Exhibition Capex '87 in Toronto, Canada
Poland 1989 - International Philatelic Exhibition World Stamp Expo '89 in Washington, United States, commemorating the 20th Congress of the Universal Postal Union
1989 Stamp Day - The 5th Anniversary of the Death of Cyril Bouda, Stamp Designer
1988 The 125th Anniversary of Slovak Cultural Society