Question about Serial number!

  1. Hi :smile: I Just got my first YSL (super stoked!) and was looking at the serial number in my card holder with a zipper and was wondering what the last 4 digits after the 6 digit number mean? That 4 digit number isnt on my white paper I’ve seen people post on other threads. Thanks in advance for helping this noob out :smile:
  2. If I am not wrong it should be the month (or production batch), and certainly year of the production.