Original Civil War Union Eagle Coat Size Button Non-Excavated 1861-1865. Authentic standard Civil War button with normal patina and loop (shank) on back. Some have various maker names on back some are smooth backs. We have several and will pick the best one for you. These are non-dug or non excavated meaning they were brought home by a soldier and not lost on the battlefield. Complete museum documentation (COA) Provided. Please see our cased versions too.