All the chrome trim around the floor panels and fold up rear seat, suggest this is a "Regal" trim model. The chrome around the tail gate glass also follows. Can't see the dash to know if the chrome knobs confirm it. A third seat WAS available, but you had to have "captive-aire" tires since there was no space for a spare. Those tires had an inner tire, so that a moderate leak or blow out allowed you to run on the inner tire...at least in theory. The front seats are unique, in that a four door wagon didn't need a split front bench, those were more typical in a 2-door to gain rear seat access. I'm wondering if those were an original special order, or a later conversion. Studebaker was pretty good about allowing almost any option you were willing to pay for.
