I think it is important to point out this is the ad in the front of the comic.
Mr. Muscles is so awesome the the city invited him to show off for the public. Your taxes dollars at work, fictional citizens.
Mr. Muscles was not alone in his perfection. Not only did he have his sidekick, Kid Muscles, but there was a Miss Muscles too! Enter your cut
This is the Miss' only comic.
AND NEXT TIME ON MR. MUSCLES...
Scans from Mr. Muscles #22 (which is really #1). Scanning by LoftyPilot.
Story by Jerry Siegel, art by Bill Fraccio