I know that I've raised this in the past, but I strongly urge all of our readers to do two things when traveling abroad:
1. Wear an inexpensive watch, preferably under $50; and
2. Select a dual-time watch so that you can have both the time at your destination as well as at home.
Wearing an inexpensive watch, is particularly important!
If you are wearing a visible watch that has greater value than $100 or is a counterfeit version of a well-known and high-end watch such as Rolex or Tag Heuer, you may be robbed at gunpoint for wearing an imitation that costs $30-50.
Criminals in developing nations may not know that you're wearing an imitation watch and may seriously injure you or worse, shoot and kill you, over a $30-50 look-a-like.
Both choices are important because if you don't know the time at your destination and what time it is at home, the impact of "jet-lag," particularly when traveling through ten or more time zones, may be realized to a much greater degree.