3. 1910 | The Rolex Oyster Perpetual

Why it Matters: The Rolex Oyster redefined where you could take a watch by making it waterproof.

The Story: Like most great innovations, the Rolex merges two simple technologies to create something that no one thought they needed but then became indispensible. The technology, the perpetual movement, was first conceived by Louis Perrelet in the 1750s and was perfected by Rolex. A small weight wound the watch when the wearer moved his or her arm, resulting in a watch that ran "perpetually" with no need for daily winding.

The next innovation was a crown that screwed down to protect the inside of the watch from water. They advertised the first model in 1910 by dunking the watches in aquariums in watch shops around the world. Rolex thus became synonymous with diving watches.