Poland postage stamp: Merkuriusz
c. 1961, honoring 300th anniversary of Polish Newspaper Press
designed by Cz. Kaczmarczyk
Poland postage stamp: child in party hat
c. 1968, commemorating “75 Years of Polish Philately”
designed by Tadeusz Michaluk
Poland postage stamp: agriculture
c. 1919
designed by Edmund Bartlomiejczyk
Poland postage stamp: brontosaurus
c. 1965
designed by Andrzej Heidrich
Poland postage stamp: Wycinanki birds
c. 1971
(I’ll be adding more from this set later, think this is from a series on Wycinanki paper cut art featuring work from different artists—any more info for this one and rest of the series is much appreciated)