Private collection, Como, Italy
Domus, no. 328, March 1957, n.p. for an advertisement of a similar example; Laura Falconi, Fontana Arte: Una Storia Trasparente, Milan, 1998, p. 113 for a similar example; Charlotte and Peter Fiell, eds., Domus Vol. IV 1955–1959, Cologne, 2006, p. 295 for an advertisement of a similar example