What is it?

Sir,
I was wondering if any readers could identify the first vehicle on the enclosed photograph ?

The picture was taken just after the First World War at Wiesbaden, Germany, and the officer between the two cars was my father, the late Captain Stephen Leonard Williams of the Royal Field Artillery. Ever since I was a small boy, many years ago, I have often tried to decide what the make is and also, was it built for the Army?

L. A. Williams.
Newark.

[Isn’t it a Stoewer, perhaps the plunder of war?—Ed.]