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davidcyclebackI would solicit (pay for if needed) the opinions of a couple of other recognized autograph experts. If they feel the autograph is authentic, you would be more comfortable in your purchase and have the additional votes of approval for your records. If they feel the autograph has is not authentic, then you can rightly complain about the lack of disclosure.
The most significant question is whether or not the autograph is genuine, not what this or that company wrote on a piece of paper. Soliciting additional expert opinions will help in judging the authenticity.
I'm no autograph expert, and certainly not someone whose opinion you should solicit on the autograph, but know that, for various and sometimes technical reasons, both PSA and SGC have refused to holder genuine baseball cards. This doesn't make the card fake.