Hey guys, I thought some members may find this article written by J.T. Stanton (coauthor of the Cherrypicker's Guide) about understanding different kinds of doubling. It gives a good analysis of doubled dies and strike doubling. Maybe it will help someone out. "Determining Die Doubling from Other Forms of Doubling" Link: http://www.shieldnickels.net/articles/Stanton_DieDoubling.pdf