Christie's, London Christie's London, July 7, 1998, Sale Catalogue Old Master Drawings. London, July 7, 1998, (cont.) In a letter to the former owner dated 12 June 1964, Professor Winkler suggested that Hoffmann's study is probably based on a drawing that Dürer made during his trip to the Netherlands in 1520-1.", cat. no. 269, fig. no. 269, pp. 250-251, ill.