A Dart (Guard pin) is a type of watch part that is used to secure the movement of the watch to the case. It consists of a round pin with a flat head and a point at the other end. The Dart is inserted into a hole in the watch case, and then the flat head is pushed against the movement to keep it securely in place. The point of the Dart is then bent over to further secure the movement. This part is important for ensuring the accurate and reliable operation of the watch.
