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James Spence Authentication (JSA)spenceloa.com · Low evidenceJames Spence Authentication (JSA) is a premier autograph authentication service that certifies the authenticity of signed memorabilia. They use professional research and the world's most extensive autograph exemplar database to validate items and increase their value. They offer on-site authentication at events and a Submit To JSA process for authentication requests, along with related fees and services.
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