Lewenstein family; offered for sale, as result of Nazi persecution, at auction house Frederik Muller & Co, Amsterdam, 8-9 October 1940, lot no. 246F, sold to "v. Groeningen", annotated copies of the sales catalog at Rijksmuseum Library, no. RPK X 1940, and Library Vrije Universiteit no. KB.05033, both Amsterdam; whereabouts unknown