PCGS sent me an e-mail last week that included a short webinar on strike designations for Jefferson Nickels, Mercury Dimes, and Roosevelt Dimes. Just thought I would share the link. http://www.pcgs.com/news/strike-par...1&spJobID=800453853&spReportId=ODAwNDUzODUzS0 I thought it was pretty informative and it gave a number of examples that both qualify and miss the criteria for the strike designation. It also provides concrete proof of the criteria that PCGS uses for their strike designations.