Knoll Pollock Arm ChairOriginally designed by Charles Pollock in 1960 and manufactured from 1964 79, the steel and leather sling chair or '657', as it is commonly called, offers a refined combination of materials and finishes. Tubular steel legs connect to cast aluminum arms with a simple cow hide seat exemplifying Pollocks simple design approach. The chair features a cushion finished in black leather. The chair was reintroduced by Knoll in 2014.