Thanks, but that's not really me. I just have a reasonable memory and still remember seeing it in a 1977 edition of Air International in a section called Plane Facts where readers would write in requesting information on an aircraft.
Remember those days - when people would write?
Probably a Schwartz, from the looks of the logo.
It certainly doesn't look like VDM, Heine or Junkers.
Heine was about equal to Schwartz in regards to supplying two-bladed props to the German aircraft industry.