Did these ever see release? This ad is the first time I’ve heard of them but it seemed that Amsco was about ten years ahead of the Madballs trend. Not only do you get Superheroes and Monsters but Planet of the Apes as well. The cards for these are fantastic, if anybody knows if they existed, drop a comment!
AKA Brian Heiler author of "Rack Toys: Cheap, Crazed Playthings" and co-editor of "Toy-Ventures Magazine". Co-Host of the "Pod Stallions" podcast. Host of the Brick Mantooth Youtube channel, painter, designer, writer, mental health advocate, toy collector, Mego, and Mego Knock-Off enthusiast. I have large feet, ADHD and I live in Canada. Talk toys, not others. 
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I've never seen any of these in my eBay trolling for pics for the Random Acts of Geekery or other blogs!
I'm fairly certain I had the spiderman one, but it could just be a false memory, since I had just about every spiderman toy I could find back then.
They were spongey and eventually the "skin" would flake off after a while, similar to the nerf footballs of the time.
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I don't remember these at all either.
Wow. These are pretty much the greatest things I have ever seen in my sad life. Thanks for the new obsession!
Yes, I have the Captain America! The art is slightly different on the produced piece…
Yes, they existed! The Sunday comic strip "Uncle Art's Funland" gave some "Planet of the Apes" balls away as prizes for their CONTEST ENTRY PUZZLES during 1975!
I have seen the Apes one on eBay before, but like most Apes items they hard to come across these days, and when you do, they cost a small fortune.
I had the Spiderman face ball, and they did have the flaky nerf skin. They were also not very dog-resistant.