Just take a look at those little generic Baseball men in the drawing above. Don't they look familiar?
Featured is an cartoon drawn by Bob Parker, and he is known to be one of an handful of artist, like MAD Magazine co-founder Jack Davis, to have his work grace the back of Topps sportscards during it's heyday.
The drawing above is actually the original artwork for an self-produced slightly larger than postcard sized (3 3/8" x 5 1/2") set he sold at collector shows throughout the 1970's to the early 1980's.