So I've read about backdating, but didn't know exactly how it worked. Well now I do!

I had an Amex back in college (I think it was the original Amex Blue, definitely a clear card) with an open date in 1997. It got closed long ago because I never used it and it only had a $600 CL. According to CreditKarma and Equifax (via Target freebie) my new Amex Blue Cash has an open date in 1997! Did not have to call for the backdate and there was a very large gap between the old card being closed and the new card being opened.