Label bibliography: m. Romanelli, s. Severi, gino sarfatti. Selected works 1938-1973, silvana editoriale, cinisello balsamo, 2012, p. 414 this piece has an attribution mark, i am sure that it is completely authentic and take full responsibility for any authenticity issues arising from misattribution, up to 250v (europe/uk standard).the wiring of this item may be original and might need replacement, if not specified otherwise.