Stan McDonald - author 's Blog

15 Dec 2021

Machine Doubling

Coins | Stan McDonald - author

Machine doubling occurs when the anvil die slightly shifts during the stamping process. Novice collectors often mistake these coins for doubled dies. An actual doubled die will show doubling over the tops of the letters and numbers and not along the side. The 1972 Lincoln cent in the photo shows the machine doubling to the right side of the numbers in the form of flat areas. The 1986-D Lincoln cent shows material around the "D" pushed off the "D," revealing the zinc. There is a 1987-D Lincoln cent in the last photo with the "D" sharply sloping downward from the initial strike. The "D" on the 1987-D cent has been several degraded on the die from overuse expanding the mintmark. Don't be fooled by these coins.
Stan McDonald - author and numismatist sinceCollecting since 1962😊



Level 5

Nice topic. Plenty to learn on doubling of any kind.


Level 5

Nice find! Thanks for the information.


Level 6

This is a good subject! I'm sure we've all made the mistake of the "ol' doubled-die"... ; ) haha

I have seen some collectors send coins to be graded, which costs $70, and then the coin comes back with no error. A recently dated Lincoln cent even in MS66 will only return about $25. Not a good investment for guessing about a DDO.


Level 6

I think everyone has confused this error at some time. Thanks.

AC coin$

Level 6

Great catch . Nice information

    No tags are attached to this post.
We use cookies to provide users the best experience on our website. If you continue without changing your cookie settings, we'll assume that you agree to receive all cookies on money.org. You may disable cookies at any time using your internet browser configuration. By continuing to use this website, you agree to our privacy policy and terms of use. To learn more about how we use cookies and to review our privacy policy, click here.