- Yankee Legend Mariano Rivera personally hand-signed this MLB Baseball and inscribed it "600 Save, 9-13-11." Rivera is hands-down the greatest closer of all-time, and his autograph is a must have for any true sports fan. This Mariano Rivera autograph is guaranteed authentic and includes a Steiner Sports Certificate of Authenticity and accompanying tamper-evident Steiner Hologram. "The Steiner Seal Means It's Real."Steiner Sports is the Exclusive Memorabilia Provider of Mariano Rivera.
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