Made of heavy brass, this 4.5x3" plate was used to print either box or advertising materials for the very desirable 1997 Limited Edition Jackie Robinson Commemorative Coins, which were approved by an act of Congress and distributed by the US Mint. As such, this printing plate includes the Great Seal of the United States, with wording (in negative) stating, "Jackie Robinson, Commemorative Coin Program, United States Mint."