If you compare the wing shape from the reverse, its actually not the same shape as whats on your coin. I can't say for sure, but I THINK this type of ghosting as Conder says, is from die wear/stress. Here's an actual clash. You can see the difference in wing shape.

and one with similar "ghosting".....

PS: It looks like yours is an O-106

and one with similar "ghosting".....

PS: It looks like yours is an O-106






















