This Autographed Vertical Dunk Photo has been Personally Signed by Michael Porter Jr. of the Denver Nuggets. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by JSA. We conducted an autograph signing with Michael Porter Jr. where multiples of the same item were signed. While the photographs are representative of this item, the size, placement and strength of the signature may vary. Each item is hand signed, therefore, each autograph is unique. This item can be verified through JSA.