Ah, the golden age of superheroes. When everything was new, and gimmicks were simple. This superhero has a jetpack. This superhero has a hat that looks like a bullet. This superhero can literally do anything required to keep kids reading the comics. A simpler time. Plus, almost all of these heroes are fully in the public domain – use ’em however you want! Like in a set of valentines, for example. So don’t forget to buy your war bonds, punch a nazi, and check out these public domain superhero valentines!