This cup topper was released in 1996 just before the Star Wars Special Editions hit theaters. They weren't released in the US. I think it was mostly Australia. I believe they were sold in Pizza Hut and Taco Bell.
This was part of a 4 cup set including C3PO, R2D2 and Darth Vader. Each cup had the picture of the character on it. These same 4 cup toppers would be re-used in 1997 for a promotion at the FAO Schwartz in Las Vegas. However the cups would be replaced with commemorative FAO Schwartz cups.