I,m one of those folks without a masters in anything to do with Museums, but here I am on the Board of Directors operating and managing a Museum - so a question to you good folks - recent acquisition - a pitcher that is supposed to be 150 years old. How can we tell? No markings on it. It was not mouthblown because it has seams on both sides. Any help is appreciated. Regards Mary Haegele Kewaunee County Historical Society Visit our website (it is a work in progress) http://www.joes.com/home/history