Norwegian Sølje Brooch--Unable to make out mark exactly

[NorskyGal]

I have a sølje brooch from what I'm sure would be Norway, but I'm unable to make out the mark. I've tried looking up different combinations of letters but can't find a maker with any of them. The combinations I've tried, based on what I think the letters in the mark look like are: GUB, GJB, CUB and CJB. Is anyone familiar with this mark and/or maker? (I took two pics of the mark using different settings on my phone as it was hard to photograph and read.)