... there are movement numberings, but until now to my knowledge noone deciphered the dating behind this.
As Rolex isn't offering any data from the factory side it was quite some work to narrow down the case serials.
Also already the clasp codes in use since mid 70s are tracked down http://www.oysterworld.de/clasp-codes.html
For older movements it should be possible to get an insight into the dates as the chronometer certifications carry case serials and movement serials.
But, as always, someone has to start data collection prior to publish a first draft which then gets more detailed by more input.