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


No announcement yet.

Rim-restricted design doubling

  • Filter
  • Time
  • Show
Clear All
new posts

  • Rim-restricted design doubling

    This post relates to duplication of peripheral design elements in the southeast quadrant of the reverse face of Washington dollars. Extra elements are replicated on the internal margin and upper surface of the design rim. Sometimes they show a rotation relative to the normal elements. Sometimes they can take up the internal half of the rim. In one case more than one set is present. Quite a few die pairs are involved. BJ Neff alerted me to the phenomenon and I've got an article on it coming out in Errorscope.


    It could represent machine doubling, ejection impact doubling, ejection doubling (sensu stricto), or something else entirely. Ideas are welcome.
    Mike Diamond. Error coin writer and researcher.