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Serena Williams Autographed 2.5x3.5 Cut Signature Auto Grade Gem Mint 10 Black Beckett BAS #15861007 Mantle-Mickey This is an Official MajorThis is a 2. 5x3. 5 Cut Signature that has been hand signed by Serena Williams. The condition of the signature was graded a Gem Mint 10 by Beckett BAS. It has been certified authentic by Beckett Authentication Services (BAS) and comes encapsulated in their tamper proof holder.