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Rob LI did the same thing with a Ruth autograph. I did quite a bit of research on one and then contacted PSA/DNA for a quick opinion. They said it may not be genuine but that they wanted to see it in person (pencil autograph). I contacted the seller and told him this information and he was taken aback. I told him that I would pay for authentication if it passed. It did pass and all was good.
Stick to your guns on this one.