This Autographed Green American Needle Masters Adjustable Hat has been Personally Signed by Jack Nicklaus. This item is 100% Authentic and comes with a PSA/DNA Certification numbered Hologram. Please note that PSA/DNA no longer provides serial-numbered COA cards; and the attached PSA/DNA sticker will serve as the complete authentication for this item. The authenticity can be verified on Professional Sports Authenticators website.