chaps,
according to the first document, Karl Freiherr von Soden entered the Bavarian army as an 18 year old on 25 April 1917. The tunic is that of a captain dated September 1915.
The man in question is Joseph Maria Freiherr von Soden-Fraunhofen, in 1914 an Oberleutnant der Reserve (25.8.13) n...