Don't spend them. There are hundreds of variety's such as rpm's and double dies.Most are not worth much in circulated conditon but are still collected by a lot of people. Some such as the 39 double die,42 D over horiztal D ,49 D over S, 54 S over D, 55 D over S carry a large premium.If you don't want to spend the time going through them sell them by the rolls on E bay. Some one will buy them just to search them.