| In support of and in addition to what Fr_Chuck has stated above, unfortunately it's probably not worth all that much since it wasn't made when the player was living. People that manufacture collectible cards are trying to sell their goods. It's about making money for them. If they think that people will buy something, they will make it.
If you look down at the bottom of this page, you will see a link to another question about a Babe Ruth Card. You might want to click on it and then the subsequent links that you find. You might find some helpful information on the sites. | 
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