How many movies have Masamitsu Igayama and Ryūnosuke Tsukigata collaborated on?

They have worked on 10 movies together! Their first movie together was Travels of Lord Mito Pt.4 (1954) while their highest rated movie together was Travels of Lord Mito Pt.10: Demon Naruto (1956). They have not worked together since Travels of Lord Mito Pt.10: Demon Naruto (1956).