Hi Bluewv1,
First, welcome to the site!
The base on that looks similar to a horizontal mill that I pulled out of a scrap yard a few years ago. Unfortunately, that's still a project waiting for some time. Mine was made at Garrigus machine works in Bristol Connecticut, before the factory was bought by Bristol Machine Tool.
Does it have an access door on the side against the wall?
Mine does for access to the big steel block that acts as counter-weight to the head. On mine the door has info cast into it.
Of course, I believe that style was popular with a number of US manufacturers. I recall another one being posted here.
I am trying to find some pictures of mine to show you.
I bet that you'll find that yours was originally a horizontal mill as well and that an owner along the way added the vertical head.
-brino