Child with stamp
(the day of the stamp in 1968)
Balloon over Poznań town hall
(Tematica exhibition in 1968)
Tematica is the name of an exhibition in Poznań, between 28 July and 11 August 1968.
75 lat ruchu filatelistycznego w Polsce = 75 years of philatelic society in Poland.
Dzień znaczka = The day of the stamp.