The model was published in 1908 for the first time and was illustrated as model 670 in the sale catalogues of J. & J. Kohn until at least 1916.
cf. Vienna Moderne 1898-1918 (exh. cat.), 1978, p. 72; Werner J. Schweiger, Wiener Werksttte: Kunst und Handwerk 1903-1932, 1982, p. 79 for another example; Siegfried Wichmann, Jugendstil Art Nouveau: Floral and Functional Forms, 1984, p. 154, fig. 315 for a detail illustration and pp. 220-221, fig. 462 for side and full views of a 'Sitting Machine'; Traum und Wirklichkeit Wien 1870-1930, 1985, p. 410, cat. no. 13/15/30 and Derek E. Ostergard, ed., Bent Wood and Metal Furniture 1850-1946, 1987, p. 258, cat. no. 56 for examples.
See Daniele Baroni and Antonio D'Auria, Josef Hoffmann e la Wiener Werksttte, 1981, p. 100 for drawings and p. 101 for an illustration of the 'Sitzmachine', p. 101, fig. 260 for a 1905 period photograph that depicts Hoffmann's 'Sitzmachine' next to his salon suite (see lot 301) consisting of a settee and two armchairs. See also a similar period photograph in Derek E. Ostergard, ed., Bent Wood and Metal Furniture 1850-1946, 1987, p. 258, fig. 56A; the photograph was taken in the hall of a small country house, Jacob & Josef Kohn display at the Kunstschau, Vienna, 1908. (From Moderne Bauforemen, 1908, p. 370).