AD Magazine: Will Burtin
Front and Back covers designed by Will Burtin for an issue that prominently featured Burtin's work.
It seems to have been a theme for many of the modern designers to create a front/back cover pair for AD/PM magazine. The mirrored style was used by Burtin, Paul Rand*, Matthew Leibowitz, and Lester Beall (maybe others?)
*thanks to Kind Company for pointing this one out to us