John, Samsung vacuums were distributed by Hibbert International here in Canada. Our local vac shop carried the Samsung line, this particular machine was called the Quiet Jet. The MOL model came with the Samsung made Digipro style powerhead....early version had metal wands and cord on the outside, later version had the direct connect telescopic wand. The TOL model came with a black 12 inch Lindhaus powerhead, and had metal wands with cord on the outside. If memory serves right, the Lindhaus powerhead also had the Samsung logo on it. So this was definitely not just a canister mated with a powerhead by the distributor, Samsung would have had a agreement with Lindhaus and made this as a package.
I have never seen one for sale in person with the Wessel Werk EBK280, but Petek, a former member from Sarnia, Ontario, did find one and posted it here, so it must have been available just not sold in my area or perhaps not a popular model. As for having the Sebo ET-C powerhead, I have never heard of that before and would think it's highly unlikely due to how expensive they were.
One interesting fact some members here may not have known - the Samsung midline canister just below this was rebadged by Hibbert International under the Electron brand as the "Electron Silver", and came with the Digipro style powerhead. The Electron line was Hibbert's exclusive vac shop line they owned and distributed. There were 3 different models - "Electron Bronze" was the BOL canister made by KingClean, available in straight suction or powerhead model with the Digipro style powerhead, and the TOL canister was a rebadged Fakir S220 canister, available in straight suction, or powerhead models had the Digipro or Lindhaus powerhead.
Rob