Help with this makers Mark???

[Lowlin]

Vintage/antique filigree brooch with what I'm guessing is a paste amethyst. Its clearly not precious metal but it has a hallmark that seems be a crest with a crown on top of the crest. And the crest has row, of im guessing, stars diagonal through the crest. Any help would be appreciated. As curiosity is slightly overwhelming.

 

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