Looks like a besseler 23c with it's head tilted back for wall projection. There is a release just under the head that will allow you to tilt the head downward to project on the baseboard.
strange looking negative stage, it could also be an early 45mx. but as the above reply indicates, it has been tilted to project against the wall. Diffently a beseler, if i remember correctly the "blue version" was an anniversity production run.
That's an old Beseler 23C. I just converted one for a 4x5 cold light. IT'll do 6x9s and if you have to push it and don't mind some clipping at the corners, maybe 4x5s too. The slide is for VC filters or a safe red filter made by Beseler.
Yep. that's a Beseler23 c II! I have one just like it. Your pics show it with it's head tilted back to project on the wall! It looks like the head is raised all the way up. It will have to be lowered to change it's orientation! You can download a manual for it at http://www.darkroompro.com/