Vintage Rhinestone Brooch Pin

Round pin with various sized silver rhinestones from 6mm to tiny 1mm. Brooch is 1 1/8" (29mm) in diameter These unusual rhinestones are silver in color, remarkably sparkly. Since they are prong set, I surmise they are glass since marcasite rarely is. Condition is excellent with no loose stones. Safety clasp is tight so pin is held securely in place. No markings