Is this Z end?

[Andad]

I have always been surprised at the number of genuine Rolex watches that are offered for sale without papers.

Now that I am learning more about Rolex I see that the number (or serial letter and number) on the watch dates the watch within a certain time span and that this can be quite a long time span.

I think we might now see Rolex simply mark the watch with a s/n but it will be the date of sale that dates the watch. This will mean that the plastic card (with purchaser, model number, s/n and date of sale) will now become very important and 'date' the watch exactly with the s/n on the card confirming the watch's ID. The card must now accompany the watch or Rolex would need to certify the authenticity via their records.