From what I've read, that safety clasp used on the first badge show didn't come into being until the 1920's. On a whim, last week I ordered the cap badge book by Campbell and O'Donnell. It came yesterday and I had not yet opened it. So, before responding I opened it and most of what they had was sewn onto the hat in some way. Most of the Civil War examples were gold bullion wire on a black cloth oval. They didn't show any CS examples that I could see from my brief scan. What they did show was a whole lot more hat badges than I had ever dreamed of! I have a U.S. Army insignia book but it's a little difficult to get to right now even though it"s only about 4 inches away. I think wreath badges like the one at the beginning of this thread may date no earlier than the Indian Wars period. Maybe one day I'll drag my army book out of it's resting place and see what it says.