Welcome to the CONECA Web Site! 
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 those pages on our site! We thank everybody who has helped make CONECA the great success that it is today!

The January/February 2019 color issue of Errorscope
has been added to the members only section of the site.
Log in today and take a look!

Errorscope features:

Our January/February issue of Errorscope features:

Two CONECA Members Receive ANA Exhibit Judge Certifications
1964 Lincoln Cent with a “Dropped Letter E”
Eisenhower (Ike) Dollar Mint Error Coins
Young Numismatists Program
1918-S Overdate Standing Liberty Quarter
Clipped/Incomplete Planchet Mint Error Lincoln Cents
Die Polishing vs Die Abrasion
Cuve’s Error-Variety Clash Round Up
1927 Doubled Die Obverse Lincoln Cent
Argentina Provides Us with Two Striking Errors
Die Clashes II
Canada 1946 Silver Dollar with Extensive Hub Doubling
CONECA State Representatives Update
State Representatives Duties

Below is a partial article by Denny Polly on Clipped/Incomplete Planchet Mint Error Lincoln Cents. Read the entire article as a CONECA Member in our members section or join and become a CONECA Member HERE today to get a the Errorscope and online members only access.

One of my favorite mint error coin types is “Struck on Clipped Planchet Mint Error Coins”. These are also more recently being called “Struck on Incomplete Planchet Mint Errors” and that is the more accurate technical description.

Some of these Planchets are “Curved Clipped” due to the coin metal strip roll not advancing past the already gang-punched holes (to create the Blank Planchets) when the next gang-punch happens, creating Blank Planchets with one or more “Curved Clips” (voids) in the newly gangpunched planchets. These sometimes find their way into the die press striking chamber and are struck into Mint Error Coins.

Some of the Planchets have a “Straight Clip” because the gang-punches go past the left or right edge of the coin metal strip roll. Those edges are trimmed straight and the resulting Planchets have a “Straight Clip” (void) in the newly punched Blank Planchet which, again, sometimes find its way into the die press striking chamber and gets struck into a Mint Error Coin.

Still other Planchets may have a “Ragged Clip” because they are gang-punched from the untrimmed ragged end of the coin metal strip roll, creating “Ragged Clip” (void) Blank Planchets which may then find their way into a die press striking chamber.



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