Unfortunately, I think it's a recent reprint of a 1956 Wheaties magazine ad. The original ad was printed in color. The one in your post is part of the growing number of "flea market" cardstock creations, intentionally aged to give an impression of being vintage. The original ad can easily be found for less than $10. It's a classic image, very similar to the Hall of Fame calendar series of the mid 1950s.
