Ok this GAI Mantle has to be good..

[rand1com]

For what it is worth(probably nothing), it is authentic IMO.

I know the last one you asked about with the GAI sticker which looked OK did not pass so maybe this one won't either. The slab dates to the "hit or miss" time frame with GAI and autographs. The serial numbers starting with 102 fall into the date range when the only real expert they ever had (Mike Guiterrez who was very good) was already gone.

I would submit it to Beckett for the $10 online opinion but crop out the GAI slab so you get an unbiased opinion. I would buy it based on the autograph irrespective of the slab but only if I was certain it would pass PSA/DNA, JSA. or Beckett.

Another online option if you are on Facebook is Out or Safe. These guys are very good on baseball autographs and especially Mantle. The fee is $6 with a couple of online payment options.

But I would not consider paying the BIN price of $1200 even if it was already authenticated by one of the trusted authenticators.

Good luck with it.