It does seem very much like the Whirlpool CVR series. But how could this be 1970? Whirlpool sold the plant to Oreck in 1963. The powerhead looks nothing like the Oreck XL-4000 being produced (in Germany) at that time. It would seem as if maybe the Whirlpool design was purchased by someone else to produce this Kenmore. This machine looks like a hard-body, and both the Whirlpool and Oreck were soft-body machines.
Eluxomarty - would you have an interest in a possible sale or trade of your CVR-2000? Being it is the prototype of the Oreck, it would mean a great deal to me.