Hello,
after some more research I managed to find the second signature that figures on banknotes from Danzig between 1919 and 1923. The man's name was Ernst Volkmann (Q1360453) (25.2.1881-27.3.1959) and he was the senator responsible for finances of the city of Danzig between 1921 and 1924. 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 responsible issuing entity was https://en.numista.com/catalogue/issuing_entity.php?id=822
Sources:
https://de.m.wikipedia.org/wiki/Ernst_Volkmann_(Senator)
https://portal.dnb.de/opac.htm?method=simpleSearch&query=117489794
https://www.bundesarchiv.de/aktenreichskanzlei/1919-1933/0000/adr/adrsz/kap1_4/para2_41.html
At last, his signature:
And a banknote with his signature:
(Source: https://wcn.pl/eauctions/170316/details/71559/Wolne-Miasto-Gdansk-1920-1939-500-marek-31101922 )
Kind regards :).
