Katie, bar the door! If you have any interest in scarce football cards from the ‘60’s, then this will surely light your lamp. Here is the ONLY example of the 1st series Checklist from the ‘66 Topps football set to garner a Mint 9 from PSA, with obviously no 10’s. Think about it - Checklists are always impossible to start with, ‘66’s are always impossible, and this card, with it’s small border size, is always impossible. It’s the Perfect Storm!