related info of the card:
http://www.americanmemorabilia.com/A...ction_ID=38331
1939 Play Ball Hank Greenberg Sample Card (#56)
This is an interesting specially produced card which was issued by Gum, Inc. only to retailers in 1939 when they were rolling out their first baseball cards. A small quantity of standard 2 1/2” by 3 3/8” cards from their very first set (#’s 1-115) were overprinted on the back with info advertising the new product, and to hopefully generate interest and sales. The additional promo text is printed on its side in red (over the standard back card text in black) and says “FREE Sample Card. Get your pictures of leading baseball players. Three picture cards packed in each package of “Play Ball America” Bubble Gum. At your candy store. 1¢”. This #56 Hank Greenberg card is otherwise identical in every way to a standard production cards issued in packs and a wonderful addition to any Tiger fan's collection.
READ THIS THREAD (from BECKETT)
http://www.beckett.com/forums/thread...t-1251998.html