My best bet for the text below BÜLOW is "Deutsche Flugzeug Werke (newline) Leipzig".

Having three pairs of struts on each wing would make it a DFW B.I, C.I or C.II, as later models (C.V,...) only had two pairs of them.

While some prototypes got a machine gun, the standard version of the DFW B.I was unarmed.

According to the book "German Aircraft of the First World War" (Peter Gray & Owen Thetford) the only difference between the C.I and C.II version is the position of the pilot (C.I: pilot in rear seat). Another source mentions the change of the machine gun from Parabellum to a synchronized one. A synchronization gear only makes sense attached to a fixed machine gun below the upper wing.

With a gun over the upper wing and assuming that Bülow is sitting in the pilot's seat, I'd say that the airplane is a DFW C.I.

My best guess for the text below BÜLOW is "Deutsche Flugzeug Werke (newline) Leipzig".

Having three pairs of struts on each wing would make it a DFW B.I, C.I or C.II, as later models only had two pairs of them.

The small gap between the wings matches the photo too.

While some prototypes got a machine gun, the standard version of the DFW B.I was unarmed.

According to the book "German Aircraft of the First World War" (Peter Gray & Owen Thetford) the only difference between the C.I and C.II version is the position of the pilot (C.I: pilot in rear seat). Another source mentions the change of the machine gun from Parabellum to a synchronized one. A synchronization gear only makes sense attached to a fixed machine gun below the upper wing.

With a gun over the upper wing and assuming that Bülow is sitting in the pilot's seat, I'd say that the airplane is a DFW C.I.