Would Rolex know the age of my watch?

[khalifam]

Hi,

Was just looking at some pre owned Rolex watches and seen some modern watches such as BLNR, Two tone sub etc that were advertised as no paperwork (I have no intention of buying either)

As the serial numbers are randomly generated if I was to take one of these watches into Rolex without paperwork how would they know if it is a 2012 watch or a 2018/2019/2020 watch? My understanding is that Rolex do not keep archives of sold watches so would the responsibility be on the customer to provide warranty card to prove the birth year of the watch?

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