Soon, other fans were asking him to confirm whether his signature on various items was a forgery or the real deal.
The 64-year-old actor encouraged his fans to study the signatures he was authenticating on his feed so they could learn to spot the phonies.
Asked if he was getting tired of repeating himself, Hamill said no.
But he was a bit embarrassed by some of the jokes he made alongside his signature years ago.
Hamill recently reprised his role as Luke Skywalker in the latest installment of the series.
The Walt Disney Co. owns ABC News and Lucasfilm, which produced \"Star Wars: The Force Awakens.\"
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