This object looks like a heavy duty clip to me on my first, puzzled, thoughts. It was recovered yesterday from the site of a former British and US WW2 army camp where universal carriers and virtually every kind of US tank infantry and artillery unit was based at some time. It measures 7 1/8 x 2 1/4 x 2 7/16 inches. It's only a pen behind the object. The left hand side is bent in compared with the right.