"Knowledge Through Education"
CONECA's Index To Error-Variety
Coin Articles Accessible On The Web
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CONECA On-Site Articles
1980-D&S Lincoln Cent Debunked by Ken Potter
A VERY Special Susan B. Anthony dollar! by Mike Diamond
2006 Lincoln Doubled Die Found Second Strong Variety Reported For Year! by Ken Potter
2006 Lincoln Cent Doubled Die Discovered by Robert Piazza & BJ Neff
MAD & O/C VA 25c Show Erratic Pattern of Error Production by Mike Diamond
The CONECA Top 100 Lincoln Cent RPMs by James Wiles
Earliest Single-Squeeze Doubled Dies Known! (Canada 1991 Snowy Owl $300 DDs) by Ken Potter
1998 American Silver Eagle 7-Coin "Strike Thru" Progression! by Ken Potter
"Oh, No It Ain't ...!!" Series by Ken Potter (Articles On Coins That Appear To Be Errors But Aren't)
The CONECA Top 100 Jefferson Nickel Varieties Listing by James Wiles & Jason Taylor
Two-Headed Coins Unlucky For Some (What are two-headed coins) by Ken Potter
Spiked Head Watch! (A Listing of "Spiked Head" & Related Die Cracks on Proof Coins)
Cortez Reports Honduran Overdate w/ Monster Doubled Die
Shield Nickel Varieties by Ken Hill
Inverted Die Installation by Mike Diamond
Standing Liberty Quarter Die And Collar Clashes by Robert H. Knauss
Diagnostic Features Of The 1922 "No D" 1c Die Pair#2 by Ken PotterRecent Finds! (Archive of the CONECA Homepage Feature)
1964 Coins Minted For Three Years! by Ken Potter
Building A Winning Exhibit by Ronn Fern
Four Unusual Cuds by Mike Diamond
German 1939-D 2 Reichspfennig Doubled Die by Ken Potter
Treatment of Minor Varieties by Ken Potter
Invisible Strikes: A Closer Look by Mike Diamond
2000 Ty-IIs -
Lincoln Cent Memorial Reverse Design Varieties
by James Wiles
How To Write An Article by Bob Larkin
Look For 2002-S "Spiked Head" Silver-Proof JFKs
CONECA Obituaries/Memorials/Remembrances
Off Site Articles Index
Determining Die Doubling From Other Forms Of Doubling by J.T. Stanton, NLG
1969-S Doubled Die 1c Roll Find May Hit $100,000
"Fresh" 1969-S Doubled Die Obverse Lincoln Cent Found In Roll
PCGS Certifies 1969-S Doubled Die Cent by PCGS
Weak Edge Inscription Jefferson Dollar Found
The Exceedingly Rare Canada 1965 Large Beads 5c Revisited by Ken Potter
Canada 1965 "Extra Bud" Doubled Die Cent by Ken Potter
Zinc 1982 Cent Host To New Doubled Die by Charles D. Daughtrey
Clipped Planchet Jefferson Dollars Certified by PCGS
1999 1c "Wide AM" Reverse Die Study by Ken Potter
2007-P Thomas Jefferson Doubled Die Reverse Found
Mike Diamond's Error-Variety Checklist
Wisconsin Quarter Die Hardness Tests Debunked by Ken Potter
Washington $1 Exhibits Tilted Edge Lettering
Double, smooth edges on 2007-P Adams by Ken Potter
New error dollar appears; Edge of Adams coins impressed twice by Ken Potter
Mint to 'tweak' processes to cut errors by Numismatic News
D-Mint Plain Edge Dollars Might Be Told Apart From P-Mint Dollars
Plain Edge Errors Found In Denver Mint Rolls
PCGS Certifies Blank Planchet, Lettered-Edge Presidential Dollar by PCGS
The Faceless Dollar Joins the Growing List of Major Washington Dollar Errors by Susan Headly
PCGS certifies lettered-edge planchet by Ken Potter
George Washington "Golden" Dollar Sports Die Gouge by Ken Potter
Presidential Dollars Fraud Report - Beware of
"Buffy Dollars"
Washington Dollar Plain Edge Coins - FAQs
A
Comprehensive List Of Reported GW Dollar Errors
The Illustrated Oregon 25c Doubled Die Listings
Doubled Die Oregon State Quarter Found!
Minnesota Quarter Doubled Die Obverse Found!
Proof Minnesota Quarter Doubled Die Found!
PCGS Will Certify Minnesota Quarter Varieties
2005-P-D-S Minnesota Doubled Die Listings
Richard’s ROOSEVELT Dime Review
2005-P Minnesota Quarters Boast Extra Tree
What Is A Major Die Break (or Cud)?
Cherrypicking by Eric von Klinger
Bison drops letter From Numismatic News by Ken Potter
1999-S Proof 1c w/Circulation Style Reverse Discovered From Numismatic News by Ken Potter
Cent's reverse rotated From Numismatic News by Billy G. Crawford
Is Your 1958 Cent The Real Doubled Die? by Ken Potter
Opinions continue to vary on cause of odd marks on Wisconsin quarters by Coin World
Coveted quarters common after all? by Tucson Citizen
2004-D Wisconsin State Quarters With Die Gouges by Ken Potter
Wisconsin excitement grows by Coin World
Wisconsin "extra leaf" quarters -- my analysis by Mike Diamond
Prices rising for Wisconsin quarters with extra 'leaves' by Coin World
PCGS Grades Wisconsin State Quarter Major Varieties by PCGS
The Minting Process by Birmingham Mint
The 1984 Doubled Ear Doubled Die Cent by Ken Potter
1997 "Double Ear" - Doubled Die Cent Diagnostics by Ken Potter
Double Struck 1904 Gold Double Eagle by Heritage
Found Treasures: 1914/3-S Nickel by Stewart Huckaby (Heritage)
1795 $1 Flowing Hair, Two Leaves. Struck over previously struck 1794 silver dollar by Heritage
1823/2 25c VF30 NGC. B-1, R.6. in ANA Sale by Heritage
1916 5c Doubled Die Obverse AU58 Realizes $39,000 by Heritage
"Superbird" Quarter Pair at Pittsburgh ANA Signature Auction by Heritage
The 2004-P Doubled Die Nickel by Ken Potter
The 2004-P Doubled Die Nickel by Jason Taylor
The 2004-P Doubled Die Nickel by Billy Crawford
Buffalo Nickel Errors and Varieties at Long Beach by Heritage
The 1883/2 Shield Nickel Web pages by Howard Spindel
Seldom Seen Selections: 1856 Flying Eagle Cent, Snow-5 by Heritage
Varieties (Over Mint Marks, etc.) On Modern Coins Of India by Paul Baker
Tips For Scanning Coins by Chuck D'Ambra
Glossary Of Numismatic Terms by Chuck D'Ambria
2003 Lincolns Found With Wavy Steps by Ken Potter
1955-S Cud Reverse / "Capped Head" Obverse Cent by Ken Potter
Interesting Die Clashes With Raised Details In Design by Ken Potter
Two-Headed Coins What they are (and what they are not) by Ken Potter
Reverse Varieties Of The 1959 Franklin Half Dollar by Ken Potter
Reader
Sends In 1948 and 1949 Canadian Cent Varieties by Ken Potter
Attribution
Guide to 1974 Canadian Nickel Dollar Varieties by Ken Potter
Chinese Cash Sports Four-eyed Dragon by Ken Potter
1950-S 25c Doubled Die Reverse Report by Ken Potter
First Franklin Half Over Mint Mark Reported! by Ken Potter
1946 Doubled Die Obverse Roosevelt Dime by Ken Potter
The 1937 Doubled Die Washington Quarter by Ken Potter
1918-S Standing Liberty Quarter "Clashed E" Next to Liberty's Knee by Ken Potter
The11-cent piece explained by Ken Potter
"Contaminated Die Design Transfers" by Ken Potter
Is My 1969-S Cent "The" Doubled Die? by Ken Potter
1970-S Small & Large Date Varieties by Ken Potter
The 1972 Doubled Die Kennedy Half Dollar by Ken Potter
Found Treasures: 1859 Transitional Dime
2003-S Proof Sacagawea Dollar "Spiked Head" Error by MintNews.com
Fey Finds 1796 Dime With Repunched 6 from Numismatic News
Spiked Head Jefferson Found! by Ken Potter from Numismatic News
Proof 2002 Nickel "Spiked Head" Die Break by Bill Penner
Coinage Struck On Foreign Planchets by Gregory N. Mirsky
About 1943 "Copper" Cents by Alan Herbert
Coinworld.com Article Index on Error Coins
Coinworld.com Article Index on Variety Coins
PCGS Library Article Index for Alan Herbert
PCGS Library Article Index for Ken Potter
CONECA Error-Variety Coin Articles Index
PCGS Article Index For World Errors
PCGS Article Index For Varieties
PCGS Article Index For World Varieties
US Small Size Dollar Coins & Related Items by Mike Wallace
Early Die State MS66 1914/3 Buffalo Nickel by Heritage
Found Treasure: 1823/2 Quarter by Heritage
Mint Tour by Frank M. Zapushek
Canadian Paper Money Errors Explained by Tom Merritt
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