This is a Vintage Swiss Made Camero Shock Protected 7 Jewels Camero 1/5 Mechanical Wind Up Stopwatch. It is definitely worn and well used, and has a crack in the faceplate towards the bottom. But it works!! Press the top button to start it, then press the top button again to stop it. Then press the side button to reset it. The smaller red circle in the middle counts the minutes as the larger black arm goes around the clock. I love it! The stopwatch weighs 3.3 oz. and the diameter of the face is 2 inches. I even tested it against my iphone stopwatch and they matched exactly! So it is working accurately.