Artist : Ludwig Hohlwein (Germany 1874-1949).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/29710534@N05">Susanlenox</a> from España
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jumborois/3125209058/">Adler bikes (1926)</a>