Mr. Zhou half case for Leica III and Leica II cameras - $38
This is a leather half case for all versions of the Leica III and Leica II cameras. The ridge provides a place to hold on with the index finger.
Here is what it looks like with a camera in it. (The camera does not come with the half case.) On the left is a Leica IIIc and on the right a Leica IIIa. The IIIa is a little smaller than the IIIc but it fits just fine. The Leica II is the same size as the Leica IIIa and IIIb. The case on the right is the one for sale. I'm keeping the on on the left. That was my Grandfathers Leica IIIc.
The ridge on the back is for the thumb. You can see the leather wraps around over the lug mounts and snaps on the back.