That is an old and unknown to me horizontal milling machine, with a vintage Bridgeport head grafted on to it, perhaps a "M" or "H" head.
Edit: On second look, that is probably an older and smaller head than a M or H head. Probably a real antique.
Second edit: The BP head does not have a movable quill, so someone has added a mechanism for lowering the entire head instead. Check back if you remain interested in it and we will talk you out of it... 8^)