Machine Doubling (MD)

[jcuve]

MD on the reverse of a 1863 Indian Head Cent:



MD on the obverse of a 2008 Washington Quarter:

[copperlover]

It is clear that the amount of MD submitted, warrants some publication that could clarify this type of occurence. Jason I think it is time for you
to start a book showing the different types of doubling. Your work so far is awsome.

Lucien

[Neighbor]

Thanks for the awesome thred, your very talented teacher. Plus the knowledge gained, I now have the perfect point of reference!

[Cdiddle]

Personally, I can not say thank you enough. I've been having soooo much trouble with doubles. This clearly explained AND shows the difference. Thank you for all the hard work of presenting this.
Cindy

[JeanK]

Learning something new everyday is very important, and Jason has gone above and beyond as a great teacher.
Thank You Jason!
Jean

[Darylscoins]

this is what we all need to understand more of the the types of doubling there really are,,, (MD) Next is the types of hub doubling.. this was very informative and detail pics OUTSTANDING!

[jcuve]

Another quick example of MD happens to have occurred on this 1958D that has a curious Die Chip on the 1 of the date. LCR member Colleen Davis (Shameless) sent me two examples showing the progression of the Die Chip ( A and B below) and how on the later example the Die Chip has Machine Doubling along with parts of Lincoln's portrait.

Oddly, a coin from the same die, on page 342 of The Error Coin Encyclopedia 4th edition (Margolis & Weinberg 2004); they state, "It is usually called the 'r958D' cent" as the r looks like a typed lower case r.

[Jim]

Wow! Now this was a killer tutorial and so well explained. I have read allot of books and you made this plain and simple. Huge Kudo's and a big thank you Jason.

Jim

[jcuve]

A recent example sent to me by Eric (eaxtellcoin) is a 1966 with somewhat strong MD on the reverse that mimics a partial Class IV (Off-set) spread. The closeup of "S of" shows (white arrows) the absence of notching, and (red arrows) the way the apparent doubling cuts into the size and shape of the normal devices (letters).

[phjr1956]

Your dedication and knowledge are a real asset to all of us "uneducated"....Thank you!