"Taken in Tunisia early morning Day #1 waiting for my 1st shot (emerging from home for robot auction). Perhaps the very first," Hamill, 65, tweeted of principal photography, which kicked off on March 22, 1976.
Shown in the background are what appeared 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.
Nearly 41 years after this photo was taken, Hamill is now preparing for his debut as an older Skywalker in "Star Wars: The Last Jedi" following an earlier cameo in "The Force Awakens".