Hi all. I recently came across a very interesting 1954 nickel. The front of the nickel appears to have another coin engraved into it. Possible a dime. You can clearly see what looks to be leaves above Jefferson's eye. You can also see writing about that. I'll try to get some clearer pictures later. I cant really explain it. Here have a look...
From the shadowing in the provided pic, may I suggest glue (or another substance on the surface of the nickel) once held a dime to the nickel.