Jaobler - sounds like I need to get out to some coin shows and get me some of those BU "proofs" - hehe. Thanks for the answer. As I got to thinking about that question struck me. biokemist6 I will look around tonight and see if I can't pick that book up. Does it cover the details like the different reverse dies used ans such? I assume it probably covers things like errors as well. Again guys this has been a lot of fun just learning this stuff.