1959 Proof D/D? Date

Do they mark them for Machine Doubling?

Amac, it is hard to tell from the pics, but it appears that the doubling is possibly all the way around the date number. If so,and I can not recall the correct term as I sit here, but when they would strike a coin with two different dies this could happen and is not Machine Doubling. It happens when a planchet is struck, in this example, with an old worn die first, and then with a new fresh die. The First strike creates a slightly spread image as the outside edges of the die are worn. Then, the new die creates a smaller or tighter image over the top of the first strike. Coppercoins book has a great definition of this and some good pics. Hope Charles looks at this one as I would like to here his thoughts.
Jim

Hi Bill. Actually, I think business strikes are hit 2 or 3 times and Proofs as many as 7 or 8 times to get the sharpness. According to Charles Daughtrey's book, "Looking Through Lincoln Cents", there is a type of double die where two different dies are used on the same planchet side. This can cause something like I am seeing here, though it is not real clear in the pics. I am hoping that Charles sees this post and casts his opinion.
Jim

Actually, I've seen the minting process, regular production cents are struck once. Modern proof cents are usually struck twice.

Thanks,
Bill