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From what I have read George Nathanial Steer had the company from 1890 until 1930 (?)
And sold it to George Nels Shaw. There are 4 marks for the jewelry and mine was the first listed, thus I assumed...

I have a brooch marked GNS and have come up short on trying to find a value range on the piece. I have found similar pieces but no prices. Any info will be appreciated. R. Swope