I know this is a truly lousy picture, but this is the only one I have. Sadly, this got away from me a few years ago, but I’ve always been really bummed that I never figured out what it is. Maybe you can help.
There’s a moving table on the back side of it — you can see an adjustment crank at the middle left of the photo — and there’s a cutter head as well. It almost looked like a tubing notcher with the horizontal cutting head, but there’s no mechanism to use it in that fashion.