I dug this button today about 20 feet from an old cellar hole. I think it is military and possibly Civil War era. Though the backmark is not clear in the photo or in-person, I believe I can see D. Evans & Co., Attleboro, Mass. I have seen similar ones posted that were dug at Civil War battle sites, so I am thinking military. I was real excited about this button, which was my only find today. However, even a gentle tooth picking is doing damage. Any safe cleaning tips? I know it will never look like the non-dug image I included in this post, but it would be nice if I could at least get it a little cleaner. Thanks … happy hunting.