Fabricated Sterling.  Approximately 2 1/2 inches.

This is my take on the traditional Bavarian/Austrian hat pin.  I altered the traditional shape and the fastening mechanism.

The pin is designed to hold either a feather or a bundle of hair (goat and badger are typical).  It is held in place with a screw.

The downy feather is from a peacock.  I found it at a zoo.

Here is the pin and its pieces.

The threaded points are inserted into the hat, and the round nuts secure it from inside the hat.