Art Deco Rhinestone & Blue Moonglow Cabachon Floral Brooch

3.5-inch long vintage Art Deco gold-tone clear rhinestone & blue moonglow cabochon floral brooch I wonder if this is an unsigned Coro. Beautiful w/a extensive patina & some darkened stones. All items $15 or less are buy 1, get 1 free. All items, including lots, are buy 1, get 1 50% off.