KA Double Wall Oven
These were pretty good ovens, they were a Chambers design that WP continued improving and selling under the KA name. It would probably date from somewhere between 1988 and 1998.
The only thing electronic on the KA oven is the clock and yes if it failed you would not be able to do Timed Bake or SC, however if this happened you could easily bypass the clock so you could clean the oven just by setting it to clean and turning it off 2 or 3 hours later. The GE oven Sandy mentioned while a great oven in its day relies on a circuit board for both baking and cleaning and it is NLA, also GE did not make 24" double wall ovens when they were making really good ovens, they did not start selling double 24" models till they bought Ropers factories and as you know Roper designed-built ovens were not the greatest.