Tick tock, tick tock, tick tock, tick .. tock, tick .... tock, tick ........ tock, tick.
Uh-oh! You know what that means. The last of your 16 watches has just quit! (Why do they all stop at the same time?) Sometimes it's as simple (not simple really, to which you could attest, if you've ever seen the inside of some of these watches) as a battery change, but other times it could be quite involved. Your watch, even the battery ones, have many tiny parts, that keep it telling time. From time to time internal cleaning (known, in the industry as an "overhaul") and/or fine tuning is required to keep it working properly.