This was in a small lot of uncleaned Roman small AEs that I bought about 12 years ago. I just came across it a few days ago, and I still don't know what it is. It's about 13 mm and weighs 2.19 grams. The metal, I'm not sure of. Sorry, but this scan is all that I've got for now. Long shot, I know, but hoping one of you recognize it.