1920 - 1930 butterfly brooch, cannot make out mark on back

I have a 1920 - 1930 blue butterfly brooch with a trombone (push/pull) fastener. I have tried to get a photo of the mark on the back, but the camera will not pick up the rubbed letters. Any clues as to what this might be please? Not sure if it’s silver even.

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Looks like French…—___—

Clean the signature gently and take a sharp photo. For now, we can only guess…

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Thank you. That’s interesting that it might be French. I did give it a gentle clean and polish with Haggerty’s polish, but I’ll have another go and concentrate on the makers mark.

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