Welcome!

Log in or register to take part.

CONECA (pronounced: CŌ´NECA) is a national numismatic organization devoted to the education of error and variety coin collectors. CONECA focuses on many error and variety specialties, including doubled dies, Repunched mintmarks, multiple errors, clips, double strikes, off-metals and off-centers—just to name a few. In addition to its website, CONECA publishes an educational journal, The Errorscope, which is printed and mailed to members bimonthly. CONECA offers a lending library, examination, listing and attribution services; it holds annual meetings at major conventions (referred to as Errorama) around the country.

CONECA was formed through a merger of CONE and NECA in early 1983. To learn more about the fascinating HISTORY OF THE ERROR HOBBY and THE HISTORY OF CONECA, we encourage you to visit us our main site Here

If you're not a member and would like to join see our Membership Application

We thank everybody who has helped make CONECA the great success that it is today!

Register Now

Announcement

Collapse
No announcement yet.

Doubled Die and Mechanical Doubling Question

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
  • #1

    Doubled Die and Mechanical Doubling Question

    As a beginner in numismatics, one of the first things I needed to learn was how to correctly identify the source of doubling I see on a coin. So I read information on the subject on the internet -- the description in Wexler's is, in my opinion, probably the best one. I have found, however, applying what I have read is not that simple. The attached photos are from a 2020 D nickel which has many doublings. I think the double lined eyelid in the 2nd photo and the extra line to the left door frames in the 6th photo are DDs, and maybe UNITED in 6 and 7th photos. The other doublings are flat and more or less shelf-like (which I interpreted to mean approximately uniform doubling width) suggesting they are probably mechanical. However the other doublings have widely varying width and orientation. For example, on MONTICELLO, the width gets narrower, then none on E, and get wider with doubling orientation changing from Northeast to West along the letters. Also the doubling width on r of liberty is not uniform and the width more than doubled across the word. Doubling on 2020, five cents, and OF are also interesting. My question is "can all these variations be produced mechanically during the punching process?"
    Attached Files
    Tags: None
  • #2
    These are all great photos. First of all, you are doing everything right while attempting to understand various kinds of doubling. Now comes the more difficult part. Trying to put all that in practice. This coin is an excellent example of machine doubling, but it happened more than once. It used to be called 'chatter' when a coin sort of vibrated in the collar while it was struck. Doubling may have occurred because of a loose die, or if the ejection was not as smooth as it should have been. If this had been on a worn die, there may also be die deterioration doubling also.
    There are instances where there is actual hub doubling and machine doubling at the same time. The one that comes to mind is the 1969S DDO-001 with strong doubling on the obverse and MD also visible on the mintmark on some examples.
    The doubling you want is the rounded type that seems to expand the size of the device. All of the doubling on your nickel is flat and shelf like and cuts into the devices. This is a real nice example of everything you don't want, but being that it is so nice, I would hold onto it as a conversation piece.
    Bob Piazza
    Lincoln Cent Attributer

    Comment

    • #3
      Thank you for your comments and explanation.

      Comment

      Previous template Next
      Working...
      X