How can I tell if a designer chair is authentic or a knockoff?

Famous modern chair designs have been copied extensively. Authentic pieces usually have consistent, high-quality materials, precise construction, and maker's labels, stamps, or tags in expected places. Many manufacturers also used specific hardware, shock mounts, or fittings that copies often get wrong.

Compare proportions carefully. Knockoffs may be slightly different in height, seat depth, or curve, and may use cheaper plywood, plastic, or leather. The underside is often where differences show, in screws, brackets, and finish quality.

Authorized reissues and licensed production also exist, and they are not fakes, but they are typically valued differently from vintage originals. Ask the seller for documentation and look up reliable references. For expensive purchases, have a dealer or appraiser who specializes in modern design examine the chair before you buy.