Not to be a tease, David ...
... but I have one.
Got it on eBay several years ago from a gay couple who buy up old appliances and completely refurbish and resell them.
But this particular mixer, they told me, was virtually NEVER USED. It sat on this woman's countertop since 1958 purely for show. The cord had dry-rotted and the mechanics needed to be de-gunked and re-lubed. But the writing on the back dial looks like it was just printed yesterday.
I use it frequently, and I love love love how powerful yet quiet it is (my little hand-held Black and Decker, on the other hand, was loud like a freaking power drill!)
Good luck in finding one for yourself. And if and when you do, a word of advice I'll pass along from the guys who sold me mine: USE IT! At the very least turn it on and run it for a full two minutes at least once a month. It's the only way to keep those mechanics from getting gunked up.
The same goes, of course, for any vintage mechanical appliance, including vacuums.