The light part has a telescopic movement so highly can be adjusted. It has a cast iron plug to the base to keep it sturdy. Unfortunately I cannot find a makers mark anywhere.
The item "Antique Victorian Converted Brass Standard Oil Lamp" is in sale since Wednesday, March 22, 2017. This item is in the category "Antiques\Antique Furniture\Lamps\Victorian (1837-1901)".The seller is "leannequinn2010" and is located in HAWORTH, West Yorkshire. This item can be shipped to United Kingdom.