Can you give me the value of the Tiffany style lamp? It is 24 inches tall, not including the finial and it is 18 inches

Sure, so first are their any markings on the base or shade?

Sure so this looks like a c.1935-1950 production rather than the period production of c.1900. Lovely American slag glass lamp. we get a large amount of similar lamps thru here on a regular basis and I bring this up to illustrate just how many people are in your shoes and why values are so low because it is such a crowded secondary market. Fair Market Value (what you may see on a typical day at auction) would be $400-500 sold 'as is' and the best solution is to list it directly yourself online in a market place rather than going the traditional route of auction or consignment.

           Suggestions for avenues for selling items yourself if that is your plan: You could try Facebook Marketplace, NextDoor.com, Offerup.com, GoAntiques.com, Etsy.com, eBay, and/or Chairish.com. Facebook Marketplace and eBay are my two favorites for this type of thing.

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It would be marked to the rim of the shade and under the base but it is most likely unmarked.