Signed Kristaps Porzingis Boston Celtics jersey. Known for his unique combination of size; shooting ability; and rim protection; Porzingis has established himself as one of the NBA's most versatile big men. His scoring; shot-blocking; and floor-spacing skills have made him a valuable contributor and an important part of the Boston Celtics' success. The signature has been professionally authenticated by PSA; giving you confidence in the authenticity of this exceptional sports memorabilia item. A great addition to any Boston Celtics; Kristaps Porzingis; or NBA memorabilia collection.