Beautiful Harry Bertoia Diamond Chair, with very rare original black leather seat cushion, for Knoll International. The chair is in good condition and the seat cushion is also without tears or holes: - Wire Diamond Chair model 421 with black leather cushion. - By Harry Bertoia for Knoll International - Chair and cover are in very good used condition - Steel wire & high-quality seat cushion by Knoll - both free of cracks, holes. 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