How many movies have Charles Willy Kayser and Emil Ferdinand Malkowski collaborated on?

They have worked on 3 movies together! Their first movie together was Gefolterte Herzen 2. Teil: Glück und Glas (1920) and was their highest rated movie together. They have not worked together since Zügelloses Blut 1. Teil: Luxusfieber (1921). They are most known for their romance films together.