It is a Leica bellows with a reflex housing, possibly a Visoflex. Sorry, I'm not up on Leica gear, so I can't tell you which versions the bellows and Visoflex are. But since they both have bayonet, not thread, mounts they're probably for Leica M. Not large format, 35 mm.

You're more likely to get a good answer if you post y'r question in the rangefinder section. That's where Leicas live.