Might look at Bradley and Hubbard. They did some green patina lamps, are known for similar iron weighted bottoms, and sometimes used Hubbel sockets.
In what parallel universe? Well under $100 in most markets.
Would like to see the shade. Not sure that it would be original to the lamp. Of course, the finial is not original.
My initial reaction was that it was not old. On close inspection, I believe that it is indeed an old one. I think more secessionist than arts...
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