Funny, my late 70's early 80's did have the filter-flo. I think it could have been made as being either a commercial washer as their were holes where a coin box would be mounted or a 1 dial. But it was a 1 speed, 1 cycle, no water level or temp switches, but it kept going and going. My tenant sold it when it was 28 years old.
It was always fun being in a filter flo laundromat. I’m sure it bothered some people but I like hearing the brake constantly kicking in on all of the washers running. There was one in the eighties into the early nineties that was full of these washers. I wish I would’ve counted them or took pictures as it was a big store. It is long gone and has been many various businesses since.