The C1-series astromech droid was a model of C-series astromech droid manufactured by Industrial Automaton. They were used during the Clone Wars and the reign of the Galactic Empire, though by then they were considered antiques and had passed their manufacturer's expiry date a few decades prior. They had three mechanical arms to manipulate objects with, and featured an electrical arc welder. CH-33P, nicknamed "Cheep," served onboard the Venator-class Star Destroyer Tribunal during Order 66 and assisted Ahsoka Tano in capturing Commander Rex as well as helping both escape the ship before being executed by clones. C1-10P, a droid nicknamed "Chopper" who served on the Ghost, was a C1 model, although he was mismatched after years of repairs and patch jobs.
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