Mystery Signature on Brooch

#1
Hello!

Just a little background, I worked as a jewelry sorter/poster for Shopgoodwill.com, I came across a brooch with a marking on it that I've never seen before, so I just thought maybe someone here might know?

Thanks!

Notes about the piece:
it's made of non-precious metal, enamel decoration and the stone is just glass.
it's marked on the longest dangle piece and the back of the main part.
it sold for $626, which is not what I expected for a costume jewelry brooch.
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Here's the link for the final sale:
shopgoodwill.com - #37470170 - Mystery Signature!? Vintage? Enamel Brooch - 3/4/2017 7:05:00 PM
 
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