Looks like one of the first two machines I owned, Cleanmaster. I got mine around 1976. Aluminum wand with it at that time. Allowing the consumer to see all the dirty water filling the tank was great marketing. They could also see that you were removing almost as much water as you put down (assuming you stayed with the 15' vac hose length).
Those were a couple machines that my dad made around 1969-70, before he started cleanmaster. They had two vac motors and pulled very well.
The clear wand didn't work to well because of glazing and cracking. Just an idea.