I suspect this may be an early 1970s Philco machine - its the door catch and the 4 sweep arm that calls out Kitchen Aid, but I remember the Philco (and its nearly 50 years) seemed to have a similar sort of mechanism although the outside catch was different. It was not unknown for dishwashers to have an enamelled tub at the time. I wonder if it is, apparently, missing a spray arm under the upper rack.
If it were me I woudl definately be bringing it home!
Al