Acquired directly from the artist by the present owner, 1973-1977
Celia Bertoia, The Life and Work of Harry Bertoia: The Man, the Artist, the Visionary, Atglen, 2015, pp. 134-35, 143 for similar examples
Beverly H. Twitchell, Bertoia: The Metalworker, London, 2019, pp. 245, 248 for similar examples