Posted By:
Greg ThebergeI agree with NO SIGNATURE at all.
It's a great piece of history. Have him sign a go-with piece of paper explaining the piece. You could type one up, have him sign it, and take a photo of the three of you (you, him, and the cap) for documentation and enjoyment.
As the great philosopher, Bill Belichick, says, "It is what it is". Personally, I think a signature would cheapen the historical aspect of the item (you don't see Hank Aaron's signature on his jersey in the HOF to the best of my knowledge).
Edited to just say I just saw you already have a signed document. If you get to meet him, take the hat and get a photo with him. Something nice to show the grandkids one day.
Just my two cents,
Greg