pio3/Shutterstock When most people think about what makes a watch tick, a battery is probably the first thing that comes to mind. How else could it run, right? Well, Rolex, one of the most famous luxury watch brands in the world, has built its luxury empire on something completely different. Other than one short-lived experiment with the Oysterquartz, every Rolex ever made has run without a single drop of battery power.  Instead of using a battery, Rolex created the Perpetual rotor in 1931, wh...