Hello everyone,
after a long search I managed to find out what signature is present on banknotes from Danzig between 1919 and 1923. That person was called Heinrich Sahm (12.9.1877- 3.10.1939)(dd-mm-yyyy)(Wikidata: Q215275). He was the mayor of Danzig between 1919 and 1920 and the president of the Danziger Senate/Magistrate between 1920 and 1931. Banknotes with his signature figure here: https://en.numista.com/catalogue/index.php?e=dantzig&r=&ct=banknote&im1=&im2=&tbb=y&tbc=y&tbl=y&tbt=y&cat=y&ru=&ca=931&no=&v=&i=&b=&ie=&u=&a=&dg=&m=&f=&t=&t2=&mt=&g=&se=&d=&c=&wi=&sw= and the issuing entity was the Danziger Zentralkasse Aktiengesellschaft https://en.numista.com/catalogue/issuing_entity.php?id=822
Here are my sources:
https://gdansk.gedanopedia.pl/gdansk/?title=RADA_MIEJSKA#
https://de.m.wikipedia.org/wiki/Heinrich_Sahm
https://kulturstiftung.org/biographien/sahm-heinrich-2
At last, the photo of the signature:
And an example photo of a banknote with his signature:
(Source: https://wcn.pl/eauctions/170316/details/71559/Wolne-Miasto-Gdansk-1920-1939-500-marek-31101922 )
Kind regards everyone!
