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Our Guarantee

Our Guarantee is simple: If any item we sell is ever found to be of doubtful authenticity, we will issue an immediate and no-questions-asked refund. The excellent reputation of each supplier we do business with is the reason we stand behind every item we sell.  In all cases a certificate of authenticity (COA) is provided with every item and many items can be validated online.

I collect sports items myself and it is the reason I started Grand Slam Sports Memorabilia (GSSM). I knew what I was paying for certain items and wanted assurance it was authentic. Unfortunately with sports memorabilia there are a lot of unscrupulous people out there selling forged autographs, be assured that will never happen at GSSM.  

The value that I offer to you is simple: You will own authentic sports memorabilia at a reasonable price. The items are all authenticated by one of the four top authentication companies in the business PSA/DNA, James Spence Authentication, Beckett, and Schwartz Sports.

Your Satisfaction Is Our Goal