Superba??
Have you gotten the model number of the unit. It is possible that it could be a Superba from 1960 which would have been one of the earliest models of the "14" series machines. This would have 3 cycles: Rinse and Hold, Full Cycle and Utility/Utensil.
Rinse and hold is obvious, full cycle and Utility/utensil(pots/pans) are identical except that the dry time is cut short on the Utility cycle so that any food not removed during the washing would not be dried on with the hot air drying.
This was the first machine with the rapid advance timers where the timer would advance to off after the rinse and hold cycle as well as automatic advance to the home position on the timer so you did not have to press anything to start the machine except the cycle button.
Parts were basically obsoleted by Hobart before Whirlpool bought the KA division. Whatever was common to the KA's and the commercial UM series on which it was based were available until 1994 and even now most of them are gone!
You will probably be able to garner a seal or two but as far as I know, the drain valves are all gone and pumps would have to be found at some of the really older independent servicers or parts houses.
But true to Kitchenaid form, if the unit is in good shape, it will probably go for many more years if this unit was truly hardly used.
It will wash well, like Dave mentioned as long as you feed it hot (140-16o) degree water and adapt to the racking requirements of the machine. If you block the spray from the single washarm with large items in the bottom rack, then the area directly above will probably be starved for water.
These units did not heat the water in the tank at all thus the really hot water requirements, plus the detergents of that era were formulated to work at that temp as well.
Good Luck and let us see some pics of it when you get a chance.