Isak Wunderlich was a master tailor and lived with his wife Scheindel, née Pohl (born 24 May 1865), at Kluckygasse 15 in Vienna's 20th district. After the annexation of Austria to the National Socialist German Reich, they were persecuted as Jews. They were registered from 5 July 1939 at Flossgasse 10 in the 2nd district. It is not recorded when Isak Wunderlich was arrested and interned at Buchenwald concentration camp. He perished there on 8 November 1939. His wife Scheindel was deported to Theresienstadt ghetto on 10 July 1942 from a "Sammelwohnung" (communal apartment) at Malzgasse 2 in the 2nd district. She was transferred on 26 September 1942 to Treblinka extermination camp and murdered there.
Between December 1941 and January 1943 the Staatliches Kunstgewerbemuseum in Wien (State Arts and Crafts Museum in Vienna, now MAK) acquired a number of silverware objects from the Dorotheum from the jewellery and precious metal items that Jews had been required to give up since 1939. Provenance research has identified two candlesticks belonging to Isak Wunderlich. They were both restituted in 2014.