cbj.jhi.pl - address in ca 1930;
Eva Neisser Echenberg and Judy Sklar Rasminsky, Walter's Welcome: The Intimate Story of a German-Jewish Family's Flight from the Nazis to Peru (Skyhorse Publishing, 2018, ISBN 13: 9781510724761), page ix (gives his date of death as 1965);
jewishgen.org - gives his date of death as 100.03.1963;
With thanks to EL for his help with researching this person.