Antique Cast Iron Arts And Crafts Lamp Base Desk Set Combo. My opinion, it has letters "P" and "T" on the bottom, but I may be wrong as they are difficult to read. It measures 8" x 3-3/4" and the longest, and is an odd looking shape. I don't see a place for a cord to come out of it at the bottom, maybe this is a base for an oil or kerosene lamp, honestly, some things are difficult for me to figure out. Only buy this if you know what it was used for, or re-purpose it to your liking. It does look like brass or copper, but it is not as it sticks to my magnet. It weighs 1.61 pounds unboxed.