I found this video on youtube, of a dealer filming as he buys himself a 52 Mickey Mantle.
Sadly, it's clear to me it's one of the fakes making the rounds, with the diagnostic Y in Mickey's signature far too high to be authentic. Not to mention, if you watch in HD, it is clear this card has been printed via a modern process. it doesn't look right at all.
I messaged the fellow to tell him he had a fake and needed to return it. No reply from him as yet. You think a dealer of all people would know better how to spot a clear phony.
https://www.youtube.com/watch?v=MyokdURQpIM