Congratulations!!!!!!!!
WOW- You are extremely fortunate.
Such a beautiful machine with the chrome handle, hence the red bag with black block motive/lines!!!! A trip down memory lane.
In South Africa we had the exact range, under the umbrella of TEDELEX made in Western Germany. The small Tedelex beat-n-sweep vacuum cleaner with the bag in front of the handle, also the TEDELEX floor polishers 2SL(2 brush no suction or bag) and the victorious 3SL which featured the 3 brushes giving you a more even and streak less shine with the suction inflatable bag which expanded when switched on.
The different colours also representing the era of the 60's, 70's and 1980's was either red, like your machine or orange or a light blue in older machines.
In Europe they were known as FAKIR.
These machines disappeared off the face of the earth. I have a TEDELEX 3SL in light blue and an European Privleg beat-n-sweep in beige and brown, however finding the reds and orange versions are non existant!!!!
Congratulations and hope you have many years of happiness of your CLarke 500.
Adrian