Dirk Nowitzki Dallas Mavericks Autographed Dark Blue #41 Jersey All Numbers, Letters and Logos Sewn On New with tags Jersey is size 50 Signature was obtained at Quicken Loans Arena (Cleveland) in October 2014 Autographed item comes with Certificate Of Authenticity from Sports-Autographs.com and a tamperproof holographic label with matching serial number to ensure that signature is 100% authentic.