These are the watches worn by some of the most powerful tech CEOs

Reuters Photographer

Since it was invented over 200 years ago, the wristwatch has been an integral component of fashion.

In addition to their practical functionality of telling time, a watch serves as a collectible piece of art that communicates the personality and style of its wearer.

With the help of Crown & Caliber, an Atlanta-based pre-owned luxury-watch marketplace, we've put together a list and commentary about the wristwatches worn by nine of the most powerful CEOs in the tech industry.