This machine is close to the White-Westinghouse machines which were at my local laundromat. They had yellow cabinets and a multiposition metal knob on the left hand side to select water temperature and the square neon lights to indicate power and last rinse.
I distinctly remember the wail these motors had when they were spinning, both spinning up and slowing the tub down.
I seem to recall that these machines didn't have any suspension, but were bolt down models and that they spun roughly around 600 RPM.
So, the vintage is very close to what I remember.