This one is a vintage Computar 105mm ~ 150mm variable focal length lens.
https://app.box.com/s/ftfro5plttrrqlz91qfi
It is not a zoom lens as we know it these days.
The focal length is set by the camera rack moving the whole lens,
and there is a scroll with trunions to move the front group to focus.
Or, as I used it mostly, just set to 135 mm with the front to infinity,
and focus conventionally with the rangefinder.
I can imagine big brass gears and a pico, but sure will never get around to doing that!
Here is the mount getting adapted to the Speed.
https://app.box.com/s/gxfofae5bu7mhmgupt97
Maybe I get it out if the weather ever warms up here.
The lens can be sharp and contrasty,
but i see last time I used it the colors are a bit ... whimsical