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By The Letter Signatures is an insert set in 2009 SP Authentic. Each player is featured on a string of letter cards, some strings spell the player’s name while others nicknames or teams. 58 current players were included in the set with a mixture of stars and average players. Each card is a manufactured letter with the players signature and each is serial numbered between 2-60 copies. The overall letter autograph insert rate was 1:12 hobby (that includes the Rookie Signature letter cards as well).

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Template:2009 SP Authentic

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