Serial numbers - same number on a few bags here

  1. I have a question about Gucci serial numbers. I have been checking the fonts, etc. on serial numbers to learn how to spot fakes, and have seen a few members post photos of their authentic bags with the same bottom serial number. What does the number on the bottom reference? Since people call this a serial number I would assume they should all be different, but if more than one person has the same number on the bottom and their bags were purchased at the Gucci botiques the number must mean something other than that? Thanks for your help!
  2. I know the top line is the style of the bag, maybe the bottom is the fabric/color combination? I don't think anyone really knows to be honest.