(Yes, it's a horrendously cleaned coin, so we'll move past that.) This trade dollar has a raised lump/bump on Liberty's arm. What could have caused it? I can't see any movement to the surrounding area that would indicate PMD or tooling (what would be the point of that?), and a die chip would be my best guess, but that's not an area you would expect to find a die chip. What are your thoughts?
