How many movies have Jan Černý and Štěpán Kopecký collaborated on?

They have worked on 16 movies together! Their first movie together was Jedna z milionu (1935) while their highest rated movie together was Žena pod křížem (1937). They have not worked together since Děvče z předměstí anebo Všecko příjde na jevo (1939). They are most known for their comedy films together.