help id this copper lamp

[douglas1]

hi ,
very heavy cast copper base , cast copper stem hand beaten thick copper sheet shade assembled with copper rivets, no makers names or dates was in my greatgrandmothers house in altoona pa, i have had in my house now for 30yrs or longer . i have never seen another one like it need help on id and value

 

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[Sterling]

looks like Arts & Crafts. do not ever polish that lamp or anything copper.. you will kill the value!

 

[jaysbenedictstudio]

Any better pictures if the bottom of the base, close-ups of the hammering and details...

This would help with a possible identification.

I have an extensive collection and knowledge base of American Arts and Crafts metal work, mainly copper.