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. Press Pass Collectibles only offers Authentic Autographs by Phil Knight through Signings, In-Person Signings or Private Collections to include a 100% money back Lifetime Authenticity Guarantee.