<p>Potsdamer Platz  Berlin &lt;a href="<a class="external free" href="https://en.wikipedia.org/wiki/Columbushaus">https://en.wikipedia.org/wiki/Columbushaus</a>" rel="noreferrer nofollow"&gt;en.wikipedia.org/wiki/Columbushaus&lt;/a&gt;  pre-1937
</p><p>Nr 23, Verlag Hermann Schmidt, Berlin W35
Wartime quality, mailed to Bohemia from Berlin Staaken, date not visible, perhaps from a worker in a camp at Staaken.
</p>
The building with Engelhardt Brau advertising is the former Cafe Josty, closed 1930
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/28179929@N08">Sludge G</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/sludgeulper/49608262968/">Columbushaus Berlin Potsdamer Platz</a>