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SERVICES
Autograph Authentication & Grading Services
ASM is the world's largest and most trustworthy signature authentication service. ASM authenticates a wide range of autographs, from sports to history and entertainment, with over 35 million objects certified. ASM continues to provide a service that collectors choose, combining decades of knowledge with cutting-edge authentication processes and an enthusiasm for the field.
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Card & Autograph Dual Grading Process

Our authenticators have a diverse knowledge base that is complemented by proprietary methods and technology to form the following four-step authentication process.

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