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Mark appears to be a butterfly, 830S is next to the mark. I do believe the brooch was made in Norway.

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Here's a few more possibilities:



The bottom scan has Tone Vigeland's VT mark on the right.
Many of her designs were manufactured by Norway Designs at Plus in Fredrikstad. That's Norway Design's mark on the left.

Regards,
Pat

I tried Filehost and it worked!

I think your piece might be by Finn Jensen.

Andy

Julius Frisenberg in Lillehammer.

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I have the same butterfly mark on a brooch of mine. He made the pieces with that mark from 1868 to 1960.