Interesting that the owner actually seems to know what they have and described them fairly accurately.
That is the 23721 washer - THE most popular model of the last line of belt-drives. The dryer is the same model as mine from what I can see. The next model up in the washer had five levels instead of three, and the next model down did not have the auto. temperature control. The next dryer up had SoftHeat.
A very common set - I would be interested to know if someone buys them for $150.
Gordon