Exactly 1 month prior to the release of Amazing Fantasy #15, there was a little story in Amazing Adult Fantasy #14 (July 1962) entitled "The Man in the Sky!"

It seems to be an innocent story by Stan Lee & Steve Ditko that involves a child with mutant abilities who is growing up learning to deal with them, but the lead character makes this story far from innocent!

As you can see, the similarity is somewhat uncanny...Maybe the authors were "trying out" the characters appearance a month prior to Spider-Man & Peter Parker arrival in history or maybe its just coincidence...We will probably never know!