Bertha Gokkes was a daughter of Salomon Meyer Gokkes and Rachel Spreekmeester. She married Simon Duka in Amsterdam on 21 June 1922, a son of Joseph Duka and Hanna Lopes Dias.
City Archive of Amsterdam, archive card of Sslomon Meyer Gokkes and website www.wiewaswie.nl .
In addition, a Jokos file (number 55103) 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 …