The product is a Bill Russell signed Boston Celtics jersey, authenticated by Altman Sports. This original autographed jersey belongs to the category of sports memorabilia, specifically basketball items. As a classic piece from the NBA era, it holds sentimental value for fans of the Boston Celtics and collectors of sports memorabilia. The authenticity of the signature adds to the overall appeal and uniqueness of this item, making it a prized possession for enthusiasts of the iconic player and team.