That's a GREAT Dishwasher!
My house growing up had that model. A TOL Superba Vericycle. I think my folks bought it in 1968 -69? Even though there was no spray arm for the upper rack, it always got everything clean the first time. You just had to load it correctly, bowls on the top rack. I knew just how to load as much as humanly possible in that thing. I'd trade my 2011 KitchenAid in a minute for a model like that.
As I recall, it was a pretty quiet Dishwasher, for it's day anyway. It was twice as quiet as the Hotpoint it replaced.
Nice find!