As Of 2002, Rolex started off like a very small micro-etching of the Rolex crown, aka the “coronet,” to the crystal within the six o’clock situation. Very tricky to see without having a loupe and almost impossible to duplicate thoroughly, this mini marking is a trademark of genuine Rolex watches. http://extension.unimagdalena.edu.co/extension/Lists/Contactenos/DispForm.aspx?ID=1155778