just an update...i spoke to people at Byard Brogan. They definitely made the necklace and they think the pearls are almost definitely freshwater...
Byard F. Brogan is still in business, but seems they've never used freshwater pearls.
i think i may have found it! to me, is looks like Byard F. Brogan on this website: https://www.langantiques.com/university/makers-marks-2/ when i...
in case it helps, here's the whole necklace
does anyone recognize this maker's mark? thanks!
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