What's that plate at the end of the upper arm? It looks like it has a name on it. Hard to make out on your photo, but it looks like it might be "Spoenwegen"???
As for the mill itself, it looks like the bed will rotate, making it a "universal" type mill. Other than that, I don't have anything to add. Good luck identifying it!
I'm new to this type of tooling, but it looks something like sk40 in the column and sk30 in the universal type head?What collet design is the spindle set up for?