Left Breastplate from a Brigandine

Dark brown metal breastplate, Brigandine, Left Breastplate, artist unspecified. Curved shape, resembling a crescent or a hook. Dark brown color with visible rust and wear. Edged with small, gold-colored metal rivets arranged in a pattern. Two gold-colored metal pieces attached to the left side. One appears to be a hinge, and the other is a small, ornate piece. Several small holes and dents on the surface. The background is light gray.