In 1968, the Rotoflex was seen in the 800 model.
My parents bought a Kenmore washer in 1968, it was the 800 model alphabet series in alvacado. It had the Rotoflex agitator with the scrubber, and detergent cap that went over it. Also, it had a third speed as well. However, the third speed was not automatic, because next to the timer dial, it had a smaller dial to the right that had three positions on it, and it had two bands around it. The outer band showed your agitation speed, while the inner band showed your spin speed. The middle position was AUTO. The letters assigned either normal or slow. To the right, was SLO-AGITATION, and SLO-SPEED no matter what letter you selected. Now,to the left side, had XSLO-AGITATION, but SLO-SPIN. Only the agitator had three speeds. Also, no matter what position the switch was in, during the cooldown part on Permanent Press, the agitator would always operate on slow.
The Rotoflex was ok, but it had one drawback to it. Some times it was known to pop a button off a shirt. When this would happen, it would scuff a little bit of the bottom of the basket. To solve this, I just use the highest setting on the water level, then later I replaced it with a Rotoswirl which is my favorite agitator.
These machines are gorgeous, I hope they will last a long time, which of course they will. Have a nice day, and thank you for the video. It brought back some memories.