Once you have the Rolex in front of you where you can can view it with your own eyes there a lot more ways to tell if it’s real or fake. On Rolex watches with a date (DateJust, Submariner, etc…) the date has to be very small to work properly and so Rolex adds a magnification glass, or Cyclops window, to allow the wearer to see it more easily. On all Rolex models the magnification is 2.5X so
the date really jumps out at you. On fake Rolex watches the magnification is often much lower at 1.5X so the date looks small and more difficult to see. This is a huge tell tale sign of a fake Rolex.
The Writing on the Dial
Everything on a Rolex is made to perfection. Without having to open up the watch it is easy to see this from the writing on the dial distinguishing the model and other features. With a magnifying glass examine all the lettering on the dial. The writing should be convex (outward) and there should be no bubbling. It should be relatively pristine. If the writing is far from perfect then you know you are not dealing with a real Rolex.
Test the watch's water-tightness. One surefire way to determine whether a supposed Rolex is real or not is to see if it is waterproof. All Rolex watches are made to be perfectly airtight — if your watch leaks even a little bit, it's probably not the real thing. To test whether your watch is waterproof, fill a cup with water, dunk the watch into the cup for several seconds, and take it out. The watch should be working perfectly fine and you shouldn't see any water inside the dial. If you do, you have a fake on your hands.
Listen closely. If you hear loud ticking from your watch this Rolex is a definite fake. Rolex watches do not make the ticking noises common with other watches. Counterfeiters can’t often perfect the gears of a Rolex and so a ticking noise is made and this can really help you spot fakes quite easily.
Misconceptions: One the biggest misconception is that the second hand of Rolex watches is a perfect sweep. This is not true most models of Rolex tick at eight ticks or movements per second so it is not a continuous sweep. Also some models move at slower speeds.
[Source(s): wikihow.com, www.bobswatches.com]