According to the article in Alter Ego #117 (June 2013), it seems Richard Hughes, who didn't write or edit for this title, created the character of Super Mouse in the early 1940's as a parody/knockoff of Superman, evidently slightly in advance of Paul Terry's Mighty Mouse. In fact, it's speculated that it's because of the slightly-prior existence of the comic book Supermouse that Mighty Mouse, who was indeed called instead Super Mouse in a couple of his earliest animated cartoons, changed his name.
Art identification by Ger Apeldoorn.
Art identification by Ger Apeldoorn.
Writer credits by Martin O'Hearn.
Art identification by Ger Apeldoorn.
Art identification by Ger Apeldoorn.
Art identification by Ger Apeldoorn.
On the inside back cover.