There is Baumarkt which is based on it:
http://www.abstractfonts.com/search/?q=Baumarkt

but I don't know the name of the original...

Thank you for this close matching answer, i didn't know that my post had been submitted last friday because i had a server error message when i tried to post it so i discovered it this morning while i was trying to post it again.

It is also possible that this font is an original creation from Dieter Schumacher and was not derived from a previous filled solid original version, and maybe the designer of the text filled the gaps on the request of the client, by adding a black outline…