Jason, between the lower lugs, it states the serial number, which would be very important to determine the age of the watch, and it would allow you to call Rolex and verify the existence of the watch. Also, between the upper lugs it shows the reference number, in your case 5513. You may need a loupe to read these numbers.

Are you holding the watch in your hands, or are you trying to buy via internet? Feel free to PM me and I will help you to make sure you are not buying a fake.