This is an
Austro-Hungarian throttle and ignition control often used in
Lloyd and possibly Knoller aircraft.
The throttle can be seen on the right side
of the cockpit in each of these two photos of Lloyd aircraft.
The aircraft on the right is identified as a Lloyd CIIc. The lower
right photo is a close-up of both throttles side-by-side.
are close-ups of the throttles in the two photos above.
Stan Dudek of Prague, Czech Republic,
kindly loaned me these two photos of Lloyd aircraft.