How can you tell if an old lamp is valuable?

To tell if an old lamp is valuable, conduct research using trusted online resources. Start by determining who manufactured your lamp by looking for a maker's mark on the base or the bulb socket. Once you know who produced your lamp, you can look to see how much similar pieces have sold for in the past to get a rough idea of the potential value of your piece. Generally, the maker, age, style and condition of a lamp all impact its market value. A certified appraiser or knowledgeable antique dealer can perform a valuation using these criteria and tell you how much your lamp is worth. On 1stDibs, find a large selection of lamps.