Klaartje Bloch-de Leeuw was the widow of Marcus Bloch. She lived at 43 Sarphatistraat, ground floor, in Amsterdam. Her jewelry was looted during the war.
The archive of the Stichting Sieraden-Comité contains correspondence, a statement of the right to inheritance from 1961 and a list of items of jewelry stolen.
NIOD, Records Stichting Sieraden-Comité, box HF 8, file 117