|Here is a reproduction that works really well. It
has the HIGH and LOW speed positions as well as the center OFF. The
two speeds are controlled by the wire-wound resistor mounted underneath it.
The only minor difference with this reproduction is that the arm is
just a tad longer than the original... But it's nickel-plated and that makes it
as close to original as you're going to find.
(Click on pictures to enlarge them.)