Think you're in reference to the ghost image on reverse. It is called PIDT, passive indirect Transfer of Design
http://www.error-ref.com/?s=PIDT
The image of the bust is pressed into the dies through multitudes of strikes,then imprinted on the coins.
http://www.error-ref.com/?s=PIDT
The image of the bust is pressed into the dies through multitudes of strikes,then imprinted on the coins.





















