Sigmund Josef Franz Nelken

Heirat_1913, Berlin:
https://www.ancestry.co.uk/discoveryui-content/view/189040977:2957?...
Divorced 1919
He lists himself as catholic, she evangelisch.

Heirat_1919, Berlin:
https://www.ancestry.co.uk/discoveryui-content/view/22579172:2957?t...
Divorced 1922
He lists himself as catholic, she evangelisch.

Heirat_1922, Berlin:
https://www.ancestry.co.uk/discoveryui-content/view/279594789:2957
Divorced 1931
1934 annotation. She reverts to maiden name.

Heirat_1931, Berlin:
https://www.ancestry.co.uk/discoveryui-content/view/189604174:2957?...

Searched MtL and Gedenkbuch: not found.
Searched for Berlin birth records listing a Siegmund Nelken as father: none found.

Naturalised French 1938:
https://www.myheritage.com/research/record-14015-908319-/franz-nelk...

Searched Arolsen and Yad Vashem: nothing found.