I am huge fan of old Electrolux vacuums.  But my fandom ends at a fraction of that price.  With that said, I'm not a collector, so what do I know.  

Good luck! 

I'm not a collector.  So what do I know, right?

But as a non collector I can tell you the ONLY people who would pay a premium for that are other collectors, which in the case of vacuum cleaners probably numbers in the hundreds or single digit thousands. 

Then you have to consider how many of those can afford to pay that price knowing the only hope of selling it is to another vacuum cleaner collector with enough money to pay for it is low.  

As they say all you have to do is find that one buyer.

I don't see vacuum collectors growing in number.  So we're talking at best a stable number, but more likely a shrinking number.

As someone who appreciates good engineering and things that are well made, the price I'd be willing to pay is a fraction of the ask. 

Put it on eBay and see if you can find that one buyer.