MY wall oven was made in 1978. It is self cleaning 27" with a shelf for a microwave that installs on top and has a standard 125V electrical receptical on top to plug in the micrrowave. It is labeled "Connect Only Litton microwave module 88OU to this receptical"

I am trying to determine what Brand and model this oven is. The only thing left on the ID plate are the imprinted data. It has 88OL (or 880L?). March 78 and 001297. I have researched a little and found out that Litton teamed up with Whirpool to sell their Microwaves, so I might have a Whirpool product, but so far no luck identifying the brand or model.

Any Ideas?:o