Platypus Pewter Brooch Silver plated â€“ Side View of Platypus Kathy & Peter of Peek-a-Boo have been producing a wide variety of quality Australian designed and handcrafted pewter products since 1990. Their range of jewellery and unique gifts are cast from high grade pewter alloy containing tin, copper and silver. The designs are polished and plated with 925 sterling silver, 18 ct gold, bronze and other finishes. From the design stage, to hand carving the original, to the finished product, every effort is made to ensure you will enjoy your Peek-a-Boo original. Comes in an organza bag.