Own a piece of basketball history with this authentic autographed Kristaps Porzingis Boston Celtics jersey! This XL jersey features everything sewn on and comes with a certificate of authenticity from Beckett Authentication Services (BAS). Whether you're a diehard Boston Celtics fan or a collector of sports memorabilia, this signed jersey is a must-have addition to your collection. Don't miss out on the chance to own a piece of NBA history today!