That is of great interest. Could you please post all the writing please, it is hard to make out all the lettering.
I had a schoolfriend in the 70's who had an Aunt that was living in East Berlin. She was American born, and had gone to Germany on vacation to visit her Grandparents. It was the summer of 1939. The War prevented her from getting out, and she stayed to look after her Grandparents, who she was trying to get to move to the U.S. where they would be safe if there was war in Europe. She ended up being stuck in East Germany, where she lived until she died.
This fellow could have had a similiar happenstance. Then got drafted.
Geo