Up the ladder
Mark, this is a 22 series dishwasher It is basically a 4 cycle machine with Pot/pan, Full Cycle, Light China and Rinse and Hold cycles.
It would be what they used to refer to as the Imperial model
and is nice because it has the rapid advance timer and the cycle indicator lights. They made the same model but with the dial knob timer as well which would have been less expensive.
No sani heat on this one and it would also have the heating element above the sump which doubled as the water heating element as well as the drying element. It has the outside mounted plastic housing blower for drying.
Pump is identical to the 21 series and last of the Hobart designed pumps to be used. The 23 started with the Whirlpool Power module.
Hope this helps