Before SGC had their own autograph authentication, they used JSA and the slabs would indicate "J Spence Auth." Once SGC had their own autograph authentication, they had red labels.
So, I could be wrong, but I am not convinced this slab has received "autograph authentication." I believe it may be authentication for the card only.
In any case, a larger image is needed to make a determination.
The Mantle signature on the 59 card appears malformed to me and I doubt it is a stamp. A larger image would help.
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