1939 air mail envelope signed in blue fountain pen (averaging 8/10) on both the front and reverse by the following nineteen members of the 1939 World Champion New York Yankees: DiMaggio, McCarthy (mgr.), Ruffing, Gordon (twice), Dickey, Dahlgren, Henrich (twice), Powell, Rolfe, Crosetti, Gallagher, Rosar, Selkirk, Hadley, Hildebrand, Pearson, Jorgens, Murphy, and Keller. (The signature of Lou Gehrig on the reverse of the envelope has been deemed a clubhouse example by PSA.) The envelope (6.5x3.5"), which is postmarked "Jun 12 1939 N. Y.," remains in Excellent condition.