How can you tell how old a lamp is by the cord?

To tell how old a lamp is by the cord, look at the plug. Antique lamps and older vintage lamps will often have plugs with prongs that are the same size, while more recent fixtures will feature polarized plugs, which have one large prong and one small prong. Antique lamps often feature exposed wires or fabric covers on their cords. You'll usually find PVC or plastic covers on newer lamps. Keep in mind that older lamps may have been rewired over the years, so the cord isn't always a reliable way to date a lamp. A certified appraiser or knowledgeable antique dealer can examine your lamp and use multiple factors to determine its age. Find a large collection of lamps on 1stDibs.