I either buy from a reputable source, (Hi Jim!!) or I buy slabbed just so I know it's authentic (or hope it's authentic). I look at multiple examples before purchasing to judge the "look" of the signature and make my decision based on what the signature is on (card, index card, photo, etc.), what was used to make the signature (pen, pencil, sharpie,etc.) and the age of the signature.
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