This museum (well more of a private collection) does not seem to be promoted much, I read about it on a facebook touring Europe group.

The Walter Breig museum in Zell am Harmersbach is a real feast for the eyes for motorcycle fans. Mobility, combined with sportiness, creativity, idealism and passion, this is what his motorcycle and toy museum has stood for since opening on May 1st, 2015.

In the museum you can expect more than 130 motorcycles, scooters and mopeds from the manufacturers DKW / IFA / MZ, Simson-Suhl, IWL and BMW / EMW on approx. 800 square meters of exhibition space spread over 2 floors.

Harzer Bikeschmiede - the technology museum for mechanics, drivers and families.