I found this piece at the S/A war camp we are hunting and have no idea what it is. The iron piece that was attached to wood, I think. It would swivel on a center pivot and the part without the studs would overlap the part with the studs. There are three beveled screw holes in the part without the studs. Two are barely noticeable but they are on each side.The bevel is on the side shown in the first picture.