Vintage Art Nouveau pendant lady with flowing hair

I bought this stunning piece about 20 years ago at the Brimfield Antique Show in MA. It has been stored away in my caboodle all this time, so I figured it's time to rehome this beautiful piece! This listing is for just the pendant, unfortunately she did not come with a necklace. Such a unique piece! Pendant is a silver-toned metal, possibly signed. Please see last picture where I'm pointing to what might a stamp. Good pre-loved condition with minimal wear and patina.