Lux 170
Brian
There is really no connection between this model and the 500 as this is a "dirty" fan whilst 500 series was clean fan.
There were three iterations of this cleaner: 152 White/Green trim, 160 coffee/cream and the 170 as shown above. The model first appeared around 1967 as the 152, the 160 around 1969 (very short lived) and the 170 ran for about 10 or 11 years.
You are correct about the dust bag box, when the clip is undone the box drops down very slightly so it can be turned through 180 degrees to replace the (paper) bag.
Tools used a pan connector attached at the front of the machine. The brushroll has a single straight brush strip positioned opposite a single straight beater bar and has the same sort of sound as a Hoover brushroll. There are no wheels on the front of the machine, just at the rear.
It was pitched up against the Hoover Junior mainly, but offered several convenince improvements such as the very easy bag replacement, quick release flex and somewhat better filtration.
I have seen a US softbag cleaner (possibly a Sears) which looks very like this cleaner (well the base anyway) - there was no softbag version of this cleaner (in the UK at least) although the successor model did have a softbag version.
Al