The shape of that handle makes me think it has one of those circular ceramic switches inside, the kind that were so popular in the 20's.
Its unusual that it would have such little power, since these are some of the strongest straight suctions you could find, from what I've read at least.
Whats interesting to me is the mechanical similarity to the later model Reginas, with the handle yoke on the wheel axis, the latch mechanism on the top of the motor housing, the brush strip, etc. They really didn't iterate much from the basic design at all through the years, just streamlined it.
Though its not labeled, I would bet Westinghouse did play a heavy part in the manufacture. This wouldn't be very long after the company's music box side went bust, so they probably wouldn't have had the capital to make everything in-house, just order castings and motors from existing companies and assemble.
Overall, very interesting piece! I love it!