Looks like you have the bones of a CH Autochamp there. It appears to be missing a bunch of things like powder measure, priming tube system, case feed tubes, it looks like the case feed turret is there however (on left). Autochamps were made in several generations, through Mk 5. They were generally set up to load a single caliber, 38, 45 ACP and 9 mm most common. Caliber changeovers were a PAIN. Hope you have the rest of it, the parts will be hard to find. Good luck.