Hans Hermann Kürsteiner, formar secretary of Swiss Esperanto-Association/ekssekretario de Svisa Esperanto-Societo
St. Müller uploaded by <a href="//commons.wikimedia.org/wiki/User:DidiWeidmann" title="User:DidiWeidmann">DidiWeidmann</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>