German Helmler 12 sound refers to the sound produced by 12 movements. Hermle 12 tone movement in Kenninga, Germany: There are 12 tone hammers 12 reeds on the movement. The reed is solid, and there is a gap around the upper joint, which can effectively vibrate and make sound. Helmler is a high-end mechanical clock and movement brand in Germany, which comes from Helmler family, a clock-making family in Black Forest, Germany.