We have no idea how many of these were made or how common they were in 1978+. However, we have found only one other "Lehrcomputer" and it is located in the collection at the University of Stuttgart in Germany. They do not seem to have a printer with the computer.
For more information, click on the link(s) below.
     University of Stuttgart

If you know the location of any other of these, please let us know by contacting us at info@EarlyComputers.com.