Sale, Sotheby’s, London, July 5, 1967, no. 88, the pair to Böhler; Julius Böhler, Munich from 1967 until sold to P. and D. Colnaghi, London [according to email of July 2002 from Georgina Duits to Martha Wolff, copy in curatorial file]; sold by Colnaghi to the Art Institute, 1974.