How many movies have Hermann Warm and Karl Gerhardt collaborated on?

They have worked on 6 movies together! Their first movie together was Die Jagd nach dem Tode - 2. Teil: Die verbotene Stadt (1920) and was their highest rated movie together. They have not worked together since Die Jagd nach dem Tode - 4. Teil: Die Goldmine von Sar-Khin (1921).