This Autographed Nike CEO November 2017 Letter has been Personally Signed by Phil Knight. This item is 100% Authentic, it comes slabbed and authenticated by Beckett Authentication Services. The authenticity can be verified on Beckett Authentication Services website. We only offers Authentic Autographs by Phil Knight through Signings, In-Person Signings or Private Collections to include a 100% money back Lifetime Authenticity Guarantee.