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C-3PO was completely covered in Gold plating in Episode III (Revenge of the Sith) as he was an Interpreter to Senators in the Galactic Senate. Somewhere between Episode III and Episode IV (A New Hope) C-3PO's left leg was implanted with a Bomb. But the leg was replaced by an unknown droid. But was replaced with a Silver leg as there was no gold parts available.

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15y ago
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6y ago

It was a spare part when is regular arm was replaced for some unknown reason. It was also the reason he had a silver leg in the A New Hope.

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Q: Why did C3PO have a red arm?
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