How many movies have Seishi Yokomizo and Tsutomu Hashimoto collaborated on?

They have worked on 1 movie together! Their first movie together was Casebooks of Dandy Sashichi: Naked Princess and Mysterious Bear Man (1959) and was their highest rated movie together. They have not worked together since Casebooks of Dandy Sashichi: Naked Princess and Mysterious Bear Man (1959).