These are the official pins that my grandfather, Henry Melville Potter, wore in 1910 to take the census in his town of Nashville, Washington County, Illinois. The other is from 1970 and I wore it when I went door-to-door in NW Spokane helping with that census. It's such fun to see his beautiful handwriting on those 1910 census pages. And the shank on that metal pin is the diameter of a small nail. Ouch.