i always start my detective work with a search like this
https://www.google.com/search?num=10...w=1331&bih=714
look through a few pages worth of results and see if you can find a match then work backwards from any info
biggest part of the value in any old lamp like that was the shade.....easiest part to get broken....some made by big names like
l.c.tiffany
https://www.google.com/#hl=en&gs_nf=...w=1331&bih=714
some oil and gas lamps were also converted to electric so wiring is not always an exact indication of age
good luck with your quest
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