Bertoia Diamond is a chair created by Harry Bertoia for Knoll. The seat and base are constructed of welded steel rods with plated polished chrome or you can choose black or white Rilsan® finish. The seat pad and cover attach directly to the frame with hidden mono-filament and metal hooks. Chrome is not suitable for outdoor use. Plastic glides included on sled base to protect floors. Bertoia Diamond is an armchair designed in the 1950s, but still strongly contemporary. Unmistakable style and class for an apparently light seat. Designer Bertoia crafted a sublime armchair with an industrial material for those times, elevating it beyond its normal usefulness in a work of art. It adapts to all types of interiors from the living room to the bedroom, to contract environments. Knoll logo stamped into the back of the base. model 421 LC K chrome structure with Cat.S Hallingdal 680 cushion