Antique Cast Sterling Huge Bird of Paradise Brooch

Here for your consideration is an antique huge Bird of Paradise Brooch. It is a cast sterling piece. It is not marked that I can see but tests for sterling. It measures 3.25" long and is heavy as it weighs a little over 20 grams. It has a patina and left unpolished. Because it is cast it has pit marks on the back. It has a C clasp. It is in good antique condition.