I'm no Mantle signature expert, but UDA autographs are (were, in the case of Mantle) done in person-- so if UDA says it is an authentic UDA signature, that's as good as it gets. UDA Mantles are always in high demand and get due premium. If it's a genuine UDA ball, a LOA from someone else would almost be redundant.
Last edited by drcy; 05-13-2016 at 04:36 PM.
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