Sorting through the belongings of my late grandfather did result in a guitar to be pass down to my branch of the family. My mother remembers it has been 'always there' so it might be bought well before 1963, or at latest around 1967. He did live at that time in western Berlin. Sadly, it's still in transit, but I was sent some photos for the moment. According to the relative packing it for the transport, the interior label reads "Hemosch Musikinstrumente" and nothing more.
To me it appears very similar to a Marma, but somehow the parts don't seem to be in line. Like it was mixed from different instruments on that hobbyist's catalogue and partly color inverted and that board is of a totally different style.
Does anybody happen to recognize this design as one particular guitar builder or model, or could help identify specific parts?