1941-S Penny, Lincoln Image Bleeding Thru Reverse Side?

I think this is called ghosting. But wait for others to chime in

Refer to the link I provided.... "Progressive Indirect Design Transfer

Definition: This is a lesser known form of Die Deterioration which transfers design outlines from one die to the other. Since there are many types of design transfer (clashed dies, brockages, etc.), it is preferable to call this type of design transfer "Progressive Indirect Design Transfer" or "PIDT". Other synonyms you're likely to encounter are "heavy design transfer", "internal metal displacement phenomenon (IMDP), and "ghosting".
Progressive indirect design transfer chiefly involves large, centrally-located design elements. It's most likely to occur in thinner denominations."

Ghosting is just another name for "Progressive Indirect Die Transfer"

Might be worth keeping in a 2 x 2 as a nice example. Not worth a premium, though.

Progressive Indirect Design Transfer: A form of Die Deterioration that manifests itself in the form of a "ghostly" image of a design element on the opposite side of a coin. The force of a die strike travels through the planchet and into the opposite die. After hundreds of thousands of strikes, the outline of the designs begin to transfer to the opposing die and show on the coins that are struck. In the case of Lincoln cents, it is common to see a ghostly outline of Lincoln's bust on the reverse of wheat cents that are struck in later die states which is how you might help identify it. It is especially visible on uncirculated coinage. This should not be confused with a die clash or a "greasy ghost."

Greasy Ghost:...A ghost-like image of Lincoln's bust seen on the reverse of some Lincoln cents caused by a build-up of grease on the reverse die. Since Lincoln's bust is a large incuse element on the obverse die, the striking pressure on the reverse die corresponding to this area is lower, and therefore grease tends to collect on the reverse die in this area and in the general shape of the bust. Coins struck-through this grease collection will show an incuse ghost-like image of the bust on the reverse. This should not be confused with Progressive Indirect Design Transfer, which is another cause of a ghost-like image of the bust on the reverse of a coin. http://goccf.com/t/436963#3757939