you are correct that you can see the image of the back "pressed" on to it. Although it's not an Error. Someone did this outside of the US Mint. The wheat stalk, and other devices are pushed into the metal. If it was from a die, it would be raised. By taking another cent, and pressing it against this, you get the exact result. you can probably wiggle another cent into the smooshed areas for a good fit if you try and not just dismiss it.
