No not a D over D nor Doubled D. It is a Copper Plated Zinc Cent with a plating issue.. it is simple plating bubble that will rupture and have Zinc Rot Read the first part of this webpage I want to share with you - http://www.error-ref.com/?s=zin rot
Also.. I just want to help you a bit here since I know you are new.. No need to create 3 separate threads on the same Cent. You can ask all your questions just on your first thread. If you don't get a response right away please be patient. It is 1:45 AM when you created the thread and most members are sleeping. Peace