- Yankees legends Mariano Rivera, Derek Jeter, Jorge Posada and Andy Pettitte have personally hand-signed this 16x20 photo. Steiner Sports is the official memorabilia provider of the New York Yankees.Inscribed Core 4 By Mariano RiveraLimited Edition of 100100% Guaranteed Authentic. Includes Steiner Sports Certificate of Authenticity. Features Tamper-Evident Steiner Hologram 100% Guaranteed Authentic Features Tamper-Evident Hologram Includes Certificate of Authenticity Online Exclusive
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