11 April 1938<div style="display: none;">date QS:P571,+1938-04-11T00:00:00Z/11</div>
Own work based on: <a rel="nofollow" class="external text" href="https://www.stuttgart.de/medien/ibs/WEB_Broschuere_70Jahre_StHelens_De-En.pdf">stuttgart.de</a>, recolored according to dialogue with City hall Stuttgart (coloration didn't change)