5 dollar bill that's printed yellow on back?

During World War 2, American Troops in North Africa were paid in money with yellow printing. The idea was that if they were captured by the Germans, then it would be easy to make the money no good. Since the Germans lost in North Africa, the money remained good and could be used when the solders returned to the United States. You may have one of those bills.

As of 03/2010, auction prices are $20.-$60. for a circulated 1934A $5 North Africa bill, while an uncirculated one could sell for $250. or more.