The Rotoflex was in the 800 model machines.
When my parents bought their new 800 series alphabet washer,it had a golden Rotoflex agitator with a scrubber,and measuring cup on top.It was avacado,with a floresent light within the top of the console panel.It was similar to the one Dick has in his collection,photo #10.However,it was a 3 speed machine.The knob to the right of the timer was the speed control,you had Auto,slow,and x-slow agitation.It only had 2 spin selection.It had an infinite water level slide switch behind the lid.This makes me think that either it was a late 68,or early 69 machine.
The Rotoflex agitator was sometimes known for pulling a button off,if you misjudged your water level.Easy fix,I usually use the highest setting.Eventually,I ended up putting a Rotoswirl in it,and that rejuvenated the machine until the timer completely died in 93,and you couldn't get a new one for it,and I didn't have a computer back then.Oh well,it had a good and long life,but if it was around today,I bet it could humiliate the direct drive machines of today. Even with the original Rotoflex. Have a nice day.