Bakelite Lucite u0026 Celluloid How to ID Bakelite A VINTAGE PLASTIC GUIDE Vintage Carved / Molded Lucite Figural Mermaid on Clam Shell Rhinestone Accent Pin Brooch Book Piece Although this brooch is never seen signed it is a commonly recognized Hattie Carnegie design as cited in sources including Jacqueline Rehmann's Classic American Costume Jewelry Measures 2 1/4 x 1.5 (images have been enlarged to show detail) Very nice vintage condition.