My Watch Stopped Keeping Time, Why?

This could be a for a few different reasons. First, you need to determine if you have an automatic or a quartz watch. A quartz watch is powered by a quartz crystal that runs off of a battery. If you have a quartz watch, and it stops keeping time, most likely the battery has died.

If your watch is an automatic, and it stops keeping time, then it needs to be re-wound. Automatic watches are powered off of the movement of the wearer’s wrist. Through normal activity a rotor turns and winds the watch's mainspring. Most automatic watches have up to 36 hours of power reserve. If an automatic watch is not worn for a day or two, it will wind down and need to be wound by hand to get it started again. You can also use a watch-winder for this function.