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davidcyclebackI beleive that 100% Authentic is, or was, American Memorabilia's in house authentication unit. I know that 100% Authentic has used, for example, Lou Lampson, who is a well known and respected expert on game used football jerseys. I do not know Mr. Peterson beyond that is listed as a photo expert at the auction house, and have nothing ill to say about him personally.
I do not wish to make things personal or snipe about this or that authentication service or the color of their serial numbered holograms. That type of stuff doesn't appeal to me. Most people familiar with these photos understand today that they were made later, and that's all that matters to me. Even Rob Lifson and Josh Evans have publicly stated that the photos were made after the 1800s, so I don't think is any more serious debate.