It reads it is a "Extremely rare 1952 Topps advertising poster with Jackie Robinson and Mickey Mantle"
I was hoping I could copy and paste the link/pg but it just takes me back to the start.
Looks legit to me, and I would assume it is if it is up for auction at REA.
(unbelievable eye candy in that catalog!!)
http://www.robertedwardauctions.com/about/catalog.php