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.

 

These 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.