When a watch stops working it can be worrisome to people to not be able to tell the time or perhaps because the watch is a heirloom piece. First you must determine whether the watch movement inside that has failed is a mechanical or a quartz movement. There is sometimes no easy solution to fixing the failed movement. When you have a watch that has an older mechanical movement, parts can be very difficult or impossible to find and replacing the original movement with a quartz electronic movement is sometimes the only solution.