: How many authentic signatures exist from that individual. For example, only five known autographs of Archibald "Moonlight" Graham exist, making them exceptionally valuable.
: Even rare and authentic items require a base of interested buyers to maintain high value. Facsimile Autograph: How to Detect Printed Signatures buy autographs
: Reputable dealers, such as those listed by PADA (Professional Autograph Dealers Association) , often provide a guarantee of authenticity. : How many authentic signatures exist from that individual