Cf: Christopher Wilk, op.cit., p. 46, fig. 51 (Similar example shown at the Thonet exhibition at Queen Victoria's Jubilee, illustrated in the Cabinet Makers and Art Furnisher, 1 July 1887) and p. 47, fig. 52.
See also: Derek E. Ostergard (ed.), Bentwood and Metal Furniture 1850-1946, New York, 1987, pp. 232-233, fig. 33