What is a baseball challenge coin?

A baseball challenge coin is a custom minted coin built around a team, league, tournament, or association instead of a military unit. Programs hand them out at the end of a season, tournaments give them to every player in the bracket, and coaches’ associations use them as a membership token.

The tradition is borrowed from military challenge coins, and so is the behavior: the coins get carried, traded, and kept long after the trophies are packed away.

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