Kellogg's Return of the Jedi Decoder disks from Australia - (1983) set of 16
I now have all the partial disks, many thanks to my friends Rob, Fred & Sheila in Australia for helping me get them
Eight are from Rice Bubbles, the other eight from Corn Flakes - thanks to Paul Taylor for this info
And here's some great scans from David Elliot and www.toysrgus.com - Thanks to David and Gus !
Here's a scan of a complete back
Here's some scans of the back of a cereal box showing the instant winner prizes and the 'message decoder',
the images are from www.ebay.com
Using the above table the code on the disc below says Darth Vader