<a href="https://en.wikipedia.org/wiki/Amar_Quartet" class="extiw" title="en:Amar Quartet">Amar Quartet</a>
=Unknown author<span style="display: none;">Unknown author</span> (The photographer is unknown and not mentioned in the source.)
by 3 December 1922 <div style="display: none;">date QS:P,+1922-12-03T00:00:00Z/7,P1326,+1922-12-03T00:00:00Z/11</div>
Newspaper "Wiener Bilder", December 3, 1922, p. 14<br><a rel="nofollow" class="external free" href="http://anno.onb.ac.at/cgi-content/anno?aid=wrb&amp;datum=19221203&amp;seite=14&amp;zoom=33">http://anno.onb.ac.at/cgi-content/anno?aid=wrb&amp;datum=19221203&amp;seite=14&amp;zoom=33</a>