A memorabilia company is accusing Dak Prescott of using a machine to sign his autograph on trading cards instead of signing himself, reports ESPN’s Darren Rovell.

Beckett Grading Services has refused to verify the Dallas Cowboys quarterback’s signature from Panini’s 2016 Prizm set after evaluating five autographed cards from collectors.

“They had a very machine-like feel,” Steve Grad, principal authenticator at Beckett, said. “You could see the starts and stops.”

Grad believes Prescott used an autopen to sign the cards, which Rovell says “politicians have used to sign documents in bulk since the late 1950s.”

“I immediately knew they were autopen,” Grad said. “I’ve never heard of a modern athlete doing this.”

Panini requires that athletes on its cards sign an affidavit stating that what they are returning is genuine.

Prescott’s representatives and Panini officials didn’t immediately respond to ESPN’s request for comments on the allegations.

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