Operating a chiming watch has always been risky. If you do the slightest thing wrong, such as setting the time while the chimes are ringing or engaged, you are likely to damage the extremely complex ? and expensive ? mechanisms inside. Thus, the first entry in the specification book for this watch was: ?Make it safe to use by an eight-year-old child.? That eight-year-old child set me the toughest assignment of my career!