The photographer Rudolph Neuer took this picture of the Casbah of Tanger. We can see the red blindstamp at the back.
I haven't got much information about this photographer active in the first decades of the XX century. His work is sometimes confused with LEHNERT et LANDROCK work who were working there during the same years. They used to sign whith R N and T (from Tanger) together.
This photo has the door of the building as the frame of the photo. During these days, in Europe there was de First World War.
Recently I have got some information about this photographer in http://michel.megnin.free.fr/ex_texte.htm