An absolute stunner of a Lamp!  Originals of this quality and condition certainly don't turn up often.  
It was probably electrified in the early 20th Century and has recently had a sympathetic electrical restoration featuring a pull-chain switch and a long twisted cloth cord. The shade appears to be made from velum with an edging in gold silk. 
Excellent working condition and cosmetically only a few spots to the shade which may improve with the correct cleaning technique.