The nickel wrapper shows the full monty:
The penny version resembles the Spalding Sports Show comics but lacks the identification on the comic, so these may have been drawn to order for Topps by Mullin.
I have to say I am a huge fan of Mullin's work-the way he presents the boxer in the above comic is pure genius. Unlike the Spalding Sports Show comics, these do not have an ACC number. You can see how the panels could be used on either version, another neat little extra. I am not sure if he added the word balloon to the penny version to make it a little more humorous of if such embellishment depended upon the subject matter at hand. The Ripleys' Believe It Or Not! mentality is evident in these, common for the times.