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Posted By: davidcycleback

Not commenting on the modern COAs, but GAI LOAs with Mike Guterrez' signature on it should be reliable. He was head of autograph authentication for a few years a while back, and you will see GAI LOAs with his name. Gutierrez is a well known autograph expert, and used to be the head autograph authenticator for Mastro Auctions (back when they wrote their own autograph LOAs) and an expert for PSA/DNA and the Sotheby's Halper Auction.

UDA (Upper Deck Authenticated) Mantle signed balls always get top dollar, as Mantle was under contract with UDA and all UDA autographs are signed in person with UDA witness. If an autograph has a UDA hologram and LOA, the signer was under contract and the autograph was signed in person, whether the signer was Ted Williams or Michael Jordan.