Max Ambach and Paula Rosenbaum married in 1913 in Leipzig.
Stadsarchief Amsterdam, archiefkaart Max Ambach
In addition, a Jokos file (number 9778) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 183/8139).