Etching on copper plate from the 'Quattro acqueforti originali ed un disegno fuori testo presentati da Guido Ballo' portfolio; Paper size 35 x 50 cm; Image size 17.6 x 21.7 cm; Frame size 41.5 x 54 cm; Edition 30 + V + 5 p.a .; Signed lower right in pencil by the Artist; Proof of Artist; Printer National chalcography of Rome and Giorgio Upiglio, Milan; References Sandro Parmiggiani, Enrico Della Torre, General catalog of graphic works 1952-2012, Skira Edizioni, p. 99, pl. 69; Certificate of guarantee.