The worst autograph I've ever seen will probably cost you. CeeDee Lamb of the Cowboys signs with what looks like the number 8 on its side. I saw that auto get a 10 grade from some new grading service called HGA (Hybrid Grading Approach).
The nicest autograph I've ever seen was Bob Gibson's. Holy crap, that guy had beautiful handwriting which one would not expect from the extremely masculine Bob Gibson. Jim Rome said Gibson was so manly that he was the only guest on his old TV show to refuse to wear make up! Yeah, Bob Gibson and make up should never be used in the same sentence.LOL