Left Breastplate from a Brigandine

The image shows a dark brown, curved piece of metal armor. The metal plate is shaped like a crescent or a hook. It has a flat top and a rounded bottom. A small metal loop is attached to the top left side. The edges of the plate are lined with small rivets. The metal has a dark brown patina with lighter brown and gray spots. The background is light gray. The metal plate appears to be a left breastplate from a brigandine by an unknown artist.