Petty  pin up girl in black lingerie with blonde hair and telephone.  Part of the True magazine center folds.
Petty was know for his use of telephones in his art as well as a idealized woman!  
Reverse side is of WWII solders raising the US Flag over Iwo Jima in 1945.  Some folding and small tear at center of fold.  Please see photos to see condition.  Approx 15X11.5 inches
Not sure what issue this center fold is from.