Looks like a die crack. Usually not any real value to these, as they are just a sign of an aging die.
As far as multiple coins per post, I prefer one coin per post, as sometimes it can get confusing if you are looking at multiple coins at once. However, if you have multiple coins with the same type of error, that would probably be ok to do multiple coins in a post, since they are similar errors.
As far as multiple coins per post, I prefer one coin per post, as sometimes it can get confusing if you are looking at multiple coins at once. However, if you have multiple coins with the same type of error, that would probably be ok to do multiple coins in a post, since they are similar errors.






















