This is a hand signed official game model Chicago Cubs jersey by Sammy Sosa. This jersey is identical to the type of jersey Sammy would wear in a game. Sammy is a member is the 500 Homerun Club & future Hall of Famer.. Sosa is best known for his record duel with Mark McGwire in their chase to surpass the previous mark of 61 home runs in a season. Both Sosa and McGwire passed the previous mark, and with Sosa still active today who knows when Slammin' Sammy will end his home run highlight reel.