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Their "about us" page suggests that they are aiming to eventually be the largest reference database for entertainment autographs. I guess they'll have to be brought onboard with these at some point.
There used to be an actual online visual database of signers in the category of classic entertainment associated with this site. It relied heavily on the authentication work of other dealers. it's been offline for quite awhile.
I'm not an expert. But I don't like any of them.