White dot on authenticity Card

Thanks. I believe I read somewhere here that the white dot started with the 10 series bags but a friend of mine is thinking of buying a bag with a number that starts with 7 and the card has a white dot. I'd post pics but I don't have any, am just trying to help a friend out.
 
I believe Chanel started to use the white dot on the late 5 series authenticity cards, so from the end of the 90's. From the 6 series up until now the authenticity card should come with a white dot.