RARE Pin Sapphire Citrine Rhinestone Brooch Made USA

All the glass stones are prong set. Being glass of course it is heavy. It weighs 45 grams. It measures 2 and 3/4 inches across and 2 3/4 inches tall - it's a big one. The stones are all secure and vibrant - no dead stones, cracks, chips or fleabites. There are tiny slim olivine navettes sandwiched between the pear shaped larger citrine / topaz.  Really nice light sapphire marquis prong set stones along with jet black rounds. Larger emerald cut center is also black

So here's what I know about this piece. 30 years ago while scouring a basement in Old Providence on my usual quest for treasures - I came upon a stash of these beauties. I sold most over the years but still hung onto a couple - hoarder that I am. They were not new when I bought them so I really have no clue how old they actually are. My best guess is 50's or 60's. This piece is immaculate.  The silver plating on the backside is gemmy. It's been tucked away and wrapped for years. Will check in the store when I go to close today but pretty sure it is.

When I bought these way back when I actually bought them with the intention of just salvaging the vintage stones but once I got them home I just couldn't do it. They were just too fine to tear apart. It's truly a beautiful vintage piece with the long lasting quality that Providence was know for. And of course a one and only. None of them were alike - all had different color stones. I do have some smaller ones and will try to remember to shoot some of those pictures and get them up. Thanks for looking.