Kellogg's - US - Star Wars Stik'R Trading Cards (1983)

Today, it would be unthinkable for two competing companies to both be given a license to produce similar products, but apparently, LucasFilm saw nothing wrong with allowing General Mills Cereals to produce cards for distribution in their cereals while at the same time allowing Kellogg's to produce trading cards that doubled as stickers for distribution in theirs.

Kellogg's Stick'R cards had a peel off sticker that revealed a card underneath, giving you two collectibles in one. Or, as most kids found, two fun ways to play with your cereal prize. These stickers/cards are now among the more difficult items for collectors to locate in good condition. There were 10 ROTJ Stick'R cards/stickers.

A similar product was also distributed in Canadian Kellogg's cereals.

Thanks to Andy Dukes for the checklist below.