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See Hamill standing on the Tunisia set on the first day of filming the first 'Star Wars.'

Mark Hamill shares Star Wars photo from first shoot day as Luke Skywalker

A long time ago in a galaxy far, far away, Mark Hamill, Carrie Fisher, and Harrison Ford began filming George Lucas’ Star Wars saga. On Saturday, Hamill shared a throwback photo from his first day at work, wearing his Luke Skywalker garb in the Tunisian desert that served as the set for Tatooine.

“Taken in Tunisia early morning Day #1 waiting for my 1st shot (emerging from home for robot auction),” Hamill tweeted of principal photography, which kicked off on March 22, 1976. “Perhaps the very 1st.” Shown in the background are what appear to be Jawas. Among the scenes planned for day one of production include Luke buying R2-D2 and C-3PO off of the desert traders.

In a separate response to a fan, the actor wrote, “Crew was kind but thought [Star Wars] was ‘rubbish’ – I kept telling them ‘We’re on a winner!'”

Star Wars: The Last Jedi will hit theaters this Dec. 15.

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