51/150. Title, signature and year lower in pencil. Artwork commissioned in 1982 by Ettore Massacesi, President of Alfa Romeo, in 150 copies with manual intervention by the artist. Total edition: 150 copies numbered from 1/150 to 150/150; V copies numbered from I/V to V/V. Publication: Burri - Catalogo generale dell'opera grafica 1949 -1994, Volume V, Fondazione Palazzo Albizzini, by Bruno Corà, 2015, p. 151; Burri Grafica. Complete work edited by C. Sarteanesi and M.Calvesi, Città di Castello 2003, p.177 (another copy). Exhibitions: Città del Castello, 1984-1985; Amiens, 1986; Lione 1986; Bolzano, 1986; Ludwigshafen, 1987; Colonia, 1987; Città del Castello, 1989-1990; Colonnella, 1999; Pordenone, 1999-2000; Città del Castello 2003-2004; Chiasso, 2010; Alassio, 2010; Gaeta, 2014.