This boxing clock or laboratory clock is a 20cm / 8 inch stopwatch. An early product by Helmut Sinn from the Sinn company (check their website) in Frankfurt, Germany. The movement was sourced by the famous Junghans watches and clock factory, also in Germany. It is made of grey tin with a wood grey painted base. Some rust on the top that gives it some age. It winds, runs, starts, stops and resets. Great conversation piece or use in games.