this is one of those items that I really believe has no business being authenticated. Not as bad as signing a golf ball (which is impossible to authenticate), but still challenging.
In this case, at best, the signature is highly questionable. This is one of those times when the TPA should have sent the money back and rendered no decision, in my opinion.
Or failed it.
http://www.ebay.com/itm/MICKEY-MANTLE-Yankees-Single-Signed-Autogra...