I have actually seen these in worse shape, with the bottoms actually rusted through!
These dishwasher are old now. Think of a family using them 2 or even 3 times a day for close to 30 years. They have run their course. We are lucky that we are able to find machines that were not run this many times a day, and often only ran once a week. Makes a big difference.
As far as the single water valve solenoid, it is a replacement. Hobart went to the single solenoid after a certain time period. Steve will know the exact date. Usually the "extra" two wires are cut off or taped back.
It is a very good parts machine. If you decided to replace the motor, and the timer is good, and there are no leaks...it would run for many more years. The tub looks fine, and would clean up well.
Good find if you ask me.
Not many dishwashers made it this long, and they always look much worse if they did when made by "other" brand names.
Thanks for the pictures.
Brent