Coke cup featuring Darth Vader and Boba Fett on Cloud City.
This was a week 1 of 4 promotion. You had to buy a medium size Coke and could then get the glass for 35 cents.
Week 2 featured an R2-D2 glass. Week 3 was Lando Calrissian. Week 4 was Luke Skywalker. They also did similar promotions for Star Wars and Return of the Jedi.