Art Deco Reverse Carved Black Bakelite) & Clear Lucite Brooch/Pin. Black center looks and feels like Bakelite (heavier than regular plastic), however, Semichrome Polish testing gives only a hint of chemical reaction. Black Bakelite is very difficult to test. Karima Parry features similar pins with this combination on page 136 of her book, 'Bakelite Pins' and describes them as Bakelite with clear lucite.
Pin dates to the late 1920s - early 1930s.
Brooch makes a statement as it measures 3-7/8" long by 2-3/8"tall and is 3/8" thick,