Here is another photograph of two underwater photographers, probably from the 1950s. I think that the one on the right has a Rolliemarine housing with a Rolleiflex. The one on the left seems to have an underwater movie camera. I don't know about the scuba equipment that they have on their chests.
You are correct about the Rolleimarine. The diver on the left is holding a Bolex movie camera and housing. Both are wearing oxygen rebreather. Maybe, someone more knowledgeable about those than I, can identify the manufacturer. Nice photo.