The Catcher was a Spy was one of the books written about Moe Berg and it's a story that still captures the imagination.  The "strangest man to ever play baseball" per Casey Stengel (an authority on that particular subject if there ever was one) has signed a 1939 Play Ball card in black ink, with sine waves of letters rolling across his chest with a PSA/DNA MINT 9 grade for his autograph.  The back of the card has heavy paper loss from an album removal.  Berg died in 1972, a result of injuries sustained in a fall, and between his mystique and his early passing, autographed cards are scarce and in high demand.   The card originates from the Shibe Park collection of autographed cards, an original owner collection carefully collected by a teenage boy who, in 1939 and 1940, obtained many autographs from players arriving at the train station near Shibe Park, and continued for many years to obtain signatures in person and through the mail.