XF 1938 S Possible Error?

It caught my eye at first just from the condition it was in during circulation. I got this, not from roll searching, but simple change. It caught my eye that the reverse has a ghostly outline image of lincoln. I'm unsure if it's simply the way the metal was shaped from the obverse or what, but figured I would post to see if you guys see what I see and any comments.

EDIT: Nevermind I neglected doing some quick simple research to find out this is very common.