Mathilda Kops worked as a seamstress with the lingerie- and ready-made clothing company SIDVA (Simon de Vries Ateliers) in Amsterdam in October 1941.
She then had been in office for two years.
Lijst van Joodsch Personeel-SIDVA Oct. '41
Mathilda Kops married on the 5th of August 1942 with 511744
City Archive Amsterdam, card Jesaias Dresden