No two teams are the same, even when playing for the same club. Between trades, retirements, and roster cuts, every year features a different iteration of a team, the collective of which has never existed before and will never exist again. As such, memorabilia that celebrates a specific team is rare.

Think of the movie, “The Sandlot.” Scotty lost a ball signed by Babe Ruth, but received something even more valuable at the end of the movie: a ball signed by the entire 1927 Yankees.

When every member of the team would take time to sign something, whether a ball or a football helmet, depending on the sport, it was likely one of the few times that season every member of the team put their name to the same item.

Singularly signed balls are also still special, especially when they represent a specific play. Baseball goes through a lot of balls during a game, and anytime one hits the dirt or leaves the park on what could be considered a notable play, it’s marked by an official for authentication, forever tying it to a significant moment.

So, unless you’re Anthony Rizzo, having the kind of access to immediately tuck the ball from the final out in the 2016 World Series into your back pocket after catching it for said out, being one of hundreds of thousands to own a ball tied to a single historical moment is something to brag about.