How many movies have Kōsaku Yamashita and Osamu Furuya collaborated on?

They have worked on 10 movies together! Their first movie together was Yakuza of Seki (1963) while their highest rated movie together was Flower and Dragon: Duel of the Sea Caves (1966). They have not worked together since Yakuza vs. Gang Leader (1974). They are most known for their drama films together.