Hi, Grant --
Yes, it was made by Gritzner-Kayser and there are Gritzner, White, Domestic, and Kenmore versions of various flavors. (There may even be a Pfaff -- not sure, though.) The White version with 2 independent length control levers (one length in forward, another in reverse) on the front is my favorite version of this machine. It is stunning.
The circular back bulge that you noticed has a lever on its left which controls the needle position. I'm not exactly sure about the long bar that goes to the back (I don't have a manual) and I haven't spent much time with this machine. It's one of the quietest machines I own.