Rare & Beautiful Victorian Oil Lamp. Unusual multi colored slag base with cased amber, over opal, on crystal, Font. About 10 1/2 tall. Slag Base diameter is about 5 3/4. Collar thread diameter about 1 1/4. One ebayer wants to separate the base from the connector or for me to guarentee that the base is threaded for the screw-on connector. Sorry I do not know. I’m not a lamp guy, but in my 30 years of glass experience I don’t think this one is a “marriage”. I have seen this lamp combination before… I personally will not tear it apart & I’m not taking it back after its been torn apart or modified in any way. The item “C1880s Antique OIL LAMP Amber & Opal Spatter Font Purple Red Green Slag Base” is in sale since Saturday, March 03, 2018. This item is in the category “Collectibles\Lamps, Lighting\Lamps\ Non-Electric\Oil”. The seller is “norepros” and is located in Schenevus, New York. This item can be shipped to United States.