Diamond Chair Model 421 by Harry Bertoia (1915-1978) for Knoll International. Version, black frame, white seat basket, painted production from the 1970s. Beautiful vintage model, the seat shell is aged in an ivory tone, the frame is matt black. Frame and shell with partial loss of color (as shown) I have official proof of authenticity such as vintage catalogs, designer records, or other literature sources and take full responsibility for any authenticity issues arising from misattribution