I have a theory on how this TriStar EX30 came to be in existence.
We all know that Harold Schoettler left Interstate Engineering, because Interstate was planning to steal his design for the next TriStar & terminate his employment. In 1989 he founded his company Schoettler Research & Engineering Corporation in Huntington Beach, California, & built the Patriot & Airstorm canisters.
I am thinking, since Schoettler left the company & took the designs with him, this was Interstate's answer to Schoettler's copycats, & their answer to what the next generation TriStar would be. TriStar here in Canada was still selling machines in 1993, the year this vacuum was made, with the 50th anniversary sticker, so it makes sense this model has one too.
Chances are, this was a experimental model in a limited market to test it out with the public to see if they would like it or not. And in this case, it failed. Hence why it is so uncommon & rarely seen. The only thing I find suspicious with this model is the serial number tag on the front....it isn't the same as Interstate Engineering made them before, plus they are usually date coded, the first two digits usually tell the year it was made, something not done with the serial number on this TriStar. That in itself is odd & suspicious.
I kind of like the design, though. It looks like some designer decided to put a modern spin on 1950's design, especially the filter grille at the back. And, since the EX30 has the newer style TriStar powerhead, we now know what year for sure the newer style was introduced. The only things I don't like are is it seems there would be no way to wrap the cord & still have the hose connected, & the filter grille in the back would eliminate the TriStar Filter Fresh system, & of course we have no idea if there would have been any optional exhaust filters for this EX30. It would have also been nice to have seen the hose handle upgraded with a suction release valve & on/off powerhead switch.
Rob