If you are in doubt, you can always find the serial number on the warranty certificate. On the watch itself it can be found on the lugs at the 6 oclock position on older models or engraved in the rehaut on newer models.
A new serial number system in 2010
In 2010, Rolex introduced a new serial number system for its watches.
This means that Rolex stopped following any sequential numbering system or order altogether, and now, Rolex engraves its watches with a randomized, and unique identifying letter and number. Before this, it was quite easy to estimate the age of a watch, as well as a year of production with the help of Rolex serial number databases.
