This Autographed 8x10 Photo has been Personally Signed by Dave Cowens of the Boston Celtics. 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. We only offers Authentic Autographs by Dave Cowens through Signings; In-Person Signings or Private Collections to include a 100% money back Lifetime Authenticity Guarantee.