GadgetGary, I saw this last night on Ebay. This is almost the exact same dishwasher that was used on The Cosby set. This is newer than Retromom's 1975 dishwasher. My sister in Dallas had neighbors with this same exact dishwasher--it's near TOL and is early to mid 1980s lookinga t the timeline of "events'.
The wash tower is the same in my machine,but i see the lower spray arm is wider,i guess when the power clean came out that's when they put the lower spray arm on a "diet" so to speak because that thin spray arm is still used today.