Peter,
When I was a kid, my parents had the exact same model as the first one you posted but it was badged "Inglis" If i remember well, it said "Scour Wash" instead of Super Scour and I think that the series was Sterling.
I have a similar (but a bit newer) Kenmore badged with only 3 buttons.
3 of my aunts had models similar to the last model you posted (yellow one). One was an Inglis Superb portable and it had the same silver panel below. Another was badged RCA and the third was an Inglis Royal 100 with no timer/selector button but indicator lights for the cycles instead.