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Articles by Ken Potter |
"Near 6" & "Far 6" Date Varieties on Canadian 1996 Five-Cent Pieces Examined
Discolored Sac & Prez Dollars -- What Are They?
2009-P-D-S District of Columbia Doubled Die Listings
1999-W 1/10th Eagle $5.00 Gold Matte Finish Error or Variety?
Authenticating 'Silver Pennies'
States Quarter Die Chips, Breaks, etc. -- Error or Variety?
New Yorker Gets Error Proof Set Birthday Surprise!
Second 1982 Doubled Die Reverse Uncovered By Reader
Collector Finds Double Struck Dollar Error In Gov. Issued Mint Set!
Doubled Die Art Medal Designed Felix Schlag
1980-D&S Lincoln Cent Debunked
List of Proof Spiked Head Varieties Grows
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
Canada 1965 "Extra Bud" Doubled Die Cent
Clipped Planchet Jefferson Dollars Certified by PCGS
Leaf-Shaped Die Dent Found On Minn. 25c
1999 1c "Wide AM" Reverse Die Study
2007-P Thomas Jefferson Doubled Die Reverse Found
2007-P Thomas Jefferson Dollar Doubled Die Reverse Found!
Wisconsin Quarter Die Hardness Tests Debunked
Two Headed Coin Unlucky for Some
2006 Lincoln Doubled Die Found Second Strong Variety Reported For Year!
Washington $1 Exhibits Tilted Edge Lettering
1999 1c "Wide AM" Reverse Die Study
Double, smooth edges on 2007-P Adams
New error dollar appears; Edge of Adams coins impressed twice
D-Mint Plain Edge Dollars Might Be Told Apart From P-Mint Dollars
Plain Edge Errors Found In Denver Mint Rolls
PCGS certifies lettered-edge planchet
George Washington "Golden" Dollar Sports Die Gouge
The Illustrated Oregon 25c Doubled Die Listings
Minnesota Quarter Doubled Die Obverse Found!
Doubled Die Oregon State Quarter Found!
Proof Minnesota Quarter Doubled Die Found!
PCGS Will Certify Minnesota Quarter Varieties
2005-P-D-S Minnesota Doubled Die Listings
2005-P Minnesota Quarters Boast Extra Tree
1970-S Small And Large Date Cent Diagnostics
2005-P-D-S Minnesota Doubled Die Listings
Differentiating 1979-S & 1981-S Mint Mark Types
Doubling: Distinguishing The Valuable From The Worthless
Is My 1969-S Lincoln Cent "The" Doubled Die?
1997 "Double Ear" - Doubled Die Cent Diagnostics
1998, 1999 & 2000 Type-2 "Proof Style Reverse" Lincoln 1c Diagnostics
Bison drops letter From Numismatic News
1999-S Proof 1c w/Circulation Style Reverse Discovered
What A Major Die Break (Cud) Is & What It Isn't!
2005-S KS Proof 25c Hoof-Shaped Die Dent vs. Alleged Wisconsin High/Low Leaf Vars.
Bahamas 1975-1973 Dual Dated 5-Cent Variety Discovered!
New 1900 Morgan Dollar Doubled Die Reverse Discovered
Matte Unc 2005-P Bison Five-Cents Doubled Die Obverse Found!
Matte Unc 2005-P Ocean In View 5c Doubled Die Obverse Found!
The 1979-81 American Hostage Crisis As Recorded In Numismatics
The Rise And Fall Of Spuds MacKenzie As Recorded In Numismatics
Doubled? Quadrupled? Quintupled? Sextupled Die? Finland 1947-S 1 Marrka
1984 Olympic Dollars Sport Deceptive Strike Doubling
In-depth Analysis Of The Wisconsin Quarter Variations
Is My 1958 Cent A Doubled Die?
The 2004-P Doubled Die Nickel Examined
The 1964-D Doubled Die Rev Dime (The Big One!)
The 1964-D Doubled Die Rev Dime (The 2nd Big One!)
2003 Lincolns Found With Wavy Steps
1950-D/S Over Mint Mark Franklin Half Discovery Confirmed
Those Fantastic States Quarter Errors!
Significant 1994 Doubled Die Reverse Lincoln Cents
Die Adjustment Strike Or Weak Strike?
Die Adjustment Strike Or Weak Strike? by Sean Moffatt
Major 1946 Doubled Die Roosevelt Dime Found
1955-S Cud Reverse / "Capped Head" Obverse Cent
Interesting Die Clashes With Raised Details In Design
Libertas Americana "Nonsense" Metallurgical Trials
1934 Lindbergh Trial Cents - What Are They?
Is It A Coin Or Medal? -- An Opinion
Major Italian Doubled Die Obv/Rev Found In Pocket Change
About Contaminated Die Design Transfer Errors
"Raised Image Strike Doubling" on 1992-P Jeffersons
Diagnostics Of Curved Clip Errors: How To Authenticate Them
1918-S Standing Liberty Quarter "E" Die Clash
1937 Doubled Die Obverse Quarter Diagnostics
1959 High Over Low Relief Eagle Double Die Reverse Half
Canada 1948 & 1949 Obverse Cent Varieties
Chinese Cash Sports Four-eyed Dragon
Selected 1962 Doubled Die Obverse Lincolns
1936-D San Diego 50c Repunched Mint Mark Report
1936 Cleveland Great Lakes Exposition
Commemorative Half Dollar Doubled Die Obverse
1935 Daniel
Boone Bicentennial
Commemorative Half Dollar Doubled Die Obverse
1963-D 50c Doubled Die Obverse Reported
1950-S 25c Doubled Die Reverse Reported
1954 25c Doubled Die Reverse Reported
Gasparro's 1977 Flowing Liberty Head $1 Trial
Germany 1989-F 1 Deutsche Mark Doubled Die Obverse Reported
Attribution Guide to 1974 Canadian Nickel Dollar Varieties
Articles by Ken Potter - Coin Universe/PCGS Author Index
Proof Minnesota Quarter Doubled Die Found!
PCGS Will Certify Minnesota Quarter Varieties
2005-P Minnesota Quarters Boast Extra Tree
So Just When Did Single-Squeeze Hubbing Begin?
Recent Finds Series (CONECA Web Site)
"Oh, No It Ain't ...!!" Series (CONECA Web Site)
1998 American Silver Eagle 7-Coin "Strike Thru" Progression!
The Canada 1991 Snowy Owl $300 Doubled Dies
Spiked Head Watch! (A Listing of "Spiked Head" & Related Die Cracks on Proof Coins)
Cortez Reports Honduran Overdate w/ Monster Doubled Die
Diagnostic Features Of The 1922 "No D" 1c Die Pair#2
1964 Coins Minted For Three Years!
German 1939-D 2 Reichspfennig Doubled Die
Look For 2002-S "Spiked Head" Silver-Proof JFKs
Links To Articles by Other Authors
A Look At The 2000 MAD Clash Cent (Formerly Called The “Extra Beard” Doubled Die) by BJ Neff
The 1968-S ''No S'' Proof Dime by Jaime Hernandez
Zinc 1982 Cent Host To New Doubled Die by Charles D. Daughtrey
Determining Die Doubling from Other Forms of Doubling by J.T. Stanton, NLG
A Die Clash Rating System by The Ike Group
Determining Die Doubling From Other Forms Of Doubling by J.T. Stanton, NLG
Mint to 'tweak' processes to cut errors by Numismatic News
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
Presidential Dollars Fraud Report - Beware of
"Buffy Dollars"
Washington Dollar Plain Edge Coins - FAQs
A
Comprehensive List Of Reported GW Dollar Errors
Richard’s ROOSEVELT Dime Review
Cherrypicking by Eric von Klinger
The Minting Process by Birmingham Mint
Cent's reverse rotated From Numismatic News by Billy G. Crawford
Opinions continue to vary on cause of odd marks on Wisconsin quarters by Coin World
Coveted quarters common after all? by Tucson Citizen
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
Sacagawea $1 has Two Hubs by Coin World
The CONECA Top 100 Lincoln Cent RPMs by James Wiles
A VERY Special Susan B. Anthony dollar!
The CONECA Top 100 Jefferson Nickel Varieties Listing by James Wiles & Jason Taylor
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 Jason Taylor
The 2004-P Doubled Die Nickel by Billy Crawford
Buffalo Nickel Errors and Varieties at Long Beach by Heritage
Varieties (Over Mint Marks, etc.) On Modern Coins Of India by Paul Baker
Seldom Seen Selections: 1856 Flying Eagle Cent, Snow-5
Found Treasures: 1859 Transitional Dime
Shades Of Silver - Art bar collectors seek the best by Paul Gilkes/Coin World
2003-S Proof Sacagawea Dollar "Spiked Head" Error by MintNews.com
Fey Finds 1796 Dime With Repunched 6 from Numismatic News
Spiked Jeff Head Seen! 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
Author's Index for Alan Herbert
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Ken Potter
P.O. Box 760232
Lathrup Village, MI 48076-0232
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Unless otherwise stated, all Photographic Images are by Ken Potter. Copyright Ken Potter, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001. Use of images in any manner is strictly prohibited without the express written permission of the copyright holder.
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