Steve Grad appears on Pawn Stars occasionally and goes through the authentication process. There may be a video or two of one of his authentications online. Basically, he looks under a microscope to determine whether it is live ink and then compares it with exemplars on his computer. It's pretty straight forward and I imagine is similar to what is done at any of the authenticators.
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Mantle Master Set - as complete as it is going to get
Yankees Game Used Hat Style Run (1923-2017): 57/60 (missing 2008/9 holiday hats & 2017 Players Weekend)
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