Here is a beautiful chrome Leicavit rapid winder with folding trigger. It replaces the baseplate on your Leica III camera and places the spring loaded film advance trigger on the bottom of the camera, making it very fast and comfortable to advance the film with the left hand and release the shutter with the right.
It is well built with classic Leica quality and looks great.
It is in excellent condition in its original box and works perfectly. There are no dents or defects to the baseplate and the mount is secure. The spring and all mechanical actions are smooth.
This is the one you want.