When it comes to modern designers, George Nelson ranks right up near the top in terms of contributions to furniture design. The Sling Sofa pictured here was manufactured in the 1960s by Herman Miller. The frame is constructed of chromed tubular steel. The seat contains black leather cushions over a leather and rubber sling seat. A piece like this is a modern classic that would fetch from $2,000-$4000 in the open market today based on its condition.