The Rolex Submariner is by far the most sought after and popular watch on the market.
It is because of this that they are also the most counterfeited. The fakes of today are much better than they have ever been with the help of lasers, CNC computer cutting machines, better printing and scanning methods, and better materials. Most decent made fakes are sold about $100-$300. But it seems all the watch fakers seem to make the same mistakes in making Submariners, and here are some of the most common to look for.
(fake link)
First, the band/bracelet of Submariner. The most common manufacture mistake on fake Submariner is that the links are solid inside, and plated in cheap gold.

(genuine link)
Look at these two genuine links. Notice they are hollow, folded metal links. These are made of solid 18K gold. Each link has a thin metal tube, with another thin tube inside that one that the screw goes through.
(fake-top / genuine-bottom)
Second, let’s talk about the screws. Like all Rolex parts, the screws of fake Submariner are finely machined and perfect, but the difference between the fake and the genuine is out there. Notice the genuine screw on the bottom, and the fake one on the top. The genuine screw has deep and perfect threads with a tapered base and flush end. The fake looks stripped out and tapered on the end.
(genuine)
Third, the face. Notice the font Rolex uses. Notice the (A) has a flat top and not pointed. Almost every fake Submariner watch has a pointed (A) except for some high quality replica Submariner watches(http://www.progiftstore.com/images/Rolex%20Submariner/DSC_0449_02.jpg) sold in Swiss Rolex Submariner category.

Ernest Jones, the Diamond and Watch specialist has launched a collection of Baume & Mercier watches, offering consumers the chance to buy the high quality Swiss Made timepieces on the high street.