Believe it or not, I bought a (new) Oster cast metal mixer about three or four years ago, but never used it. I just liked the way it looked. This thread kind of worked on me, so today I cleaned it, added three scoops vanilla, 1/2 cup cold milk, and 2 tbs chocolate syrup, and had my first ever homemade chocolate shake. Yum.
OK, it's not a vintage machine, but at least it's cast metal, and not that plastic junk that is also sold under the Oster name these days.
Best part - no toggle switch to break off. Instead, you turn the top of the motor casing to switch between Low-Off-High.