Wilhelm Dyrssen sometime after 1923 when he was promoted to the amiral.
Unknown author<span style="display: none;">Unknown author</span>
<cite class="book" style="font-style:normal">(in Swedish) (1930) <i> <a rel="nofollow" class="external text" href="http://runeberg.org/svda/1929/0242.html">Svenska Dagbladets Årsbok. SJUNDE ÅRGÅNGEN (Händelserna 1929)</a></i>, <a href="https://en.wikipedia.org/wiki/en:Stockholm" class="extiw" title="w:en:Stockholm"><span title="capital and largest city of Sweden">Stockholm</span></a>:  Svenska Dagbladet, p. 242  <small></small></cite>