This Autographed 2004-05 Offensive Playbook with the inscription of "Go Bills!" has been Personally Signed by Mike Mularkey of the Buffalo Bills. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by Beckett Authentication Services. The authenticity can be verified on Beckett Authentication Services website. Further accompanied by a Letter of Authenticity from Mike Mularkey himself.