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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.
Autograph Authentication Process
Our authenticators have a broad knowledge base that is supplemented by unique methodologies and technology to build the four-step authentication procedure shown below.
Our History
ASM is the world’s leading third-party authentication service
for autographs and memorabilia.
ASM, the renowned provider of autograph authentication services, was established in 1998 to combat the proliferation of counterfeit, forged, and pirated signed collectibles. ASM's innovative grading system has revolutionized the way in which collectibles are valued, traded, and enjoyed, and its four-tier authentication process has greatly enhanced the hobby of autograph and memorabilia collecting. Over the years, ASM has authenticated countless autographs and collectibles from the realms of sports, music, entertainment, politics, and history, including some of the most valuable specimens in existence.
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