This Autographed Sealed 1989 Starting Lineup Slam Dunk Superstars has been Personally Signed by Larry BIrd of the Boston Celtics. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by Beckett Authentication Services. This is a BAS Witnessed Protection Program item which means a Beckett Authentication Service representative was present when this item was being signed. The authenticity can be verified on Beckett Authentication Services website. Please refer to photos for condition prior to purchase.