What if a baseball card has no print on the back?

Answer 1

Blank Back Error Cards

There are different variations of errors on Baseball cards. Some more desirable than others. Errors such as mistakes made on information on the card will only be worth more money if the mistake was corrected, and the card that was printed in the fewest quantity is worth the most. Not necessary the card with the error.

Other errors are made during the printing process. "Flopped" negative image, Wrong back, Blank back, printed half off center combined with another player to name a few examples. There are a descent amount of collectors that collect these type of errors but not enough to skyrocket the price. (in most cases)