Your best bet might be to take it to a local card show (if there are any in your area) and have a few dealers look at it in person. Sometimes that's the only way to be definitive about a card's authenticity. BTW, that's the DiMaggio card from the '49 Leaf set (some refer to it as the '48 Leaf set), and the "1" is there because it's card #1 in the set (each card gets a number).
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