How to spot a genuine Bertoia chair. There is a Knoll stamp on the back of the frame and Knoll is printed on the fabric under the seat pad, which is visible by looking under the chair. Another key point when comparing the real thing vs. a copy is that each individual vertical wire strut sits on top of the wire frame. Most manufacturers of copies have changed this design, which is more difficult to achieve. Instead they use a horizontal piece of wire at the top which covers up all the vertical struts.
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