In September of 1954, Robert C. Atherton conducted a daring experiment -- he hired one of his favourite and most trusted illustrators to produce all of the artwork for an entire issue of Cosmopolitan and had him use different styles and pseudonyms...
Who could pull off such a Herculean task? Why Al Parker, of course.
If you managed to guess Artist X's identity, good for you! And If I tricked you in my post above, well, remember that I also treated you to a lovely huge stack of Al Parker art... even if you didn't know it.