If you look carefully, what appears to have have happened is that a chunk has come out of the lower 3. It's a piece missing. The question is, did it happen at striking which would make it an interesting (but probably not valuable) misstrike, or has been gouged out since? hi i know what you are getting at with the chunk but would pinching out after striking account for the leg sticking out at the back of the lower 3 in the middle some friends of mine suggested that it may possibly be a backwards £ sign