A little bit of both!
The machine in the picture is a "HOBART DESIGN" but is not the original design of the Hobart 21's. This is a later developed machine which used the large loop element that sat just above the tank bottom.By this point, only the Superba and Monterrey series had the sump heater. This machine can be an Imperial model or even the Custom model which had a pots and pan, normal, light/china and rinse and hold cycles.I had that machine and it was a KDC21D model which had the higher line features of the Imperial like the adjustable racks and the tank trim and China Guard.
All the original Hobart built models had the heating element in the sump and had a heating indicator light on the control panel. The unit in the picture shows the big loop element and lacks the light or so it would seem.
What is important is the fact that regardless if it was built by Hobart or Whirlpool(actually Emerson/ISE),it had the Hobart design which was probably the best pump you could ever have gotten. Once Whirlpool really took over, they fitted the design with their power module pump. Another great washing system. IMHO, the grinding system in that setup cannot hold a candle to the 21/22 Hobart pump/disposer unit but did have a larger soil collection chamber and gave great results too.
If you find a machine of that design in good condition, you will always be happy with it. The same would go for any newer KA of the standard tub size with the power module pump. They cant hold as many dishes, but will give good results.