There is precious little information (as in none) regarding exactly how many sizes, shapes, and permutations of these vintage Godzilla puffy stickers exist, and new ones continue to sporadically turn up. I was shocked to run across this one recently. It's nearly 9 inches square, and includes 18 stickers. As a quick glance at our list of American Vintage Godzilla Collectibles will tell you, there are tons of these!
All we really can say is the obvious: they were made to promote the Hanna-Barbera cartoon, are dated 1979, and seem to list all of the current license holders, while omitting any actual manufacturer. We may never know if these were even legitimate or not!
On the back is a smudgy stamp saying "Peel Off Backing, Made in Taiwan." Not much of a clue!