Part III. Die Installation Errors:

Mules (ES May/June 2010)

• • Wrong hammer die
    • 2005 Malaysian 1 sen obverse die paired with 10 sen reverse die and struck on a copper-nickel 10 sen planchet in a 10 sen collar
    • 1995 cent/dime mule
  • Wrong anvil die
    • Malaysian 1 sen reverse die paired with a 2005 10 sen obverse die and struck on a copper-nickel 10 sen planchet in a 10 sen collar
    • 1993-D and 1999 cent/dime mules
  • Wrong hammer and anvil die
    • 2005 Malaysian 1 sen obverse and reverse dies used to strike a 10 sen planchet in a 10 sen collar
    • Maryland quarter on Sac planchet in Sac collar (3 specimens)
  • Two anvil dies
    • Foreign
      • 1982 Jamaica cent with two obverse faces
      • Chilean 100 pesos bi-metallic with two obverse faces (1 known specimen)
      • 1 Euro cent with two reverse faces
    • Domestic
      • Two-tailed clad dime (1 known specimen, probably from 1965)
      • Two-tailed clad quarter (3-4 known specimens, probably from 1965)
  • Two hammer dies
    • Foreign
      • 1982 Jamaica cent with two reverse faces
    • Domestic
      • 1859 Indian cent with two obverse faces (unique)
      • 1863 Broas Pie Bakers token (Civil War Store card token)
  • Two obverse or two reverse dies (die setup unclear)
    • 2000-P nickel with two obverse dies (CW 6/26/17)
  • Two different countries
    • (1967) Bahamas 5c/New Zealand 2c mule
  • Different denominations
    • Washington 25c/Sacagawea $1 mules (16 specimens, 3 die pairs)
      • COIN WORLD SPECIAL: article posted HERE
  • Mule die larger than normal die and collar
    • 1995 cent/dime mule
  • Mule die same size or smaller than normal dies and collar
    • (All known U.S. mules employ dies of different sizes)
  • Temporal mule (mule die representing same denomination but from an earlier or subsequent year) (CW 1/24/14)
    • 1959-D wheat-back cent (unique)
    • 2000 Macedonia 1 denar muled with obverse die used in prior and later years
  • Temporal/transitional mule (dies from different years with change in planchet composition) (CW 5/9/16)
    • 1942-S silver alloy five cent coin with small S-mintmark to right of Monticello (unique) (CW 5/9/16)
    • 1993 bimetallic Russia 50 roubles (St. Petersburg mint set only) (ES March/April 2010; CW 3/20/17)
  • Regular-issue die muled with commemorative die
    • September and November 1999 Canadian quarters
  • Regular-issue die muled with government medal or token die
    • 2000 Canada “map mule”
  • Regular-issue die muled with private token, medal, or nonsense die (ES Jan/Feb 2008, CW 11/25/13)
  • Mules involving pattern dies (various types)
    • Normal die paired with pattern or prototype die (CW 2/2/04)
  • Collar mules (collar from different denomination of same or similar size installed)
  • Lettering die mule (mismatch between edge lettering applied before or after strike and the design shown on the obverse and reverse face)
    • Presidential dollar with wrong date on edge.
      • 2009 Zachary Taylor dollar with 2010-D edge inscription (rather than 2009-D inscription) (CW 2/22/10, 3/1/10)
    • 2007-D Sacagawea dollar with Presidential dollar edge lettering (CW 7/9/12)
  • Pseudo-mules (3 pathways) (CW 4/25/11, 3/19/12, 4/23/12, 12/11/17, 12/17/18, 2/22/21, 12/12/22) COIN WORLD SPECIAL: article posted HERE
    • Canadian Pseudo-mules
      • COIN WORLD SPECIALS: articles posted HERE and HERE
    • One U.S. two-tailed quarter may belong in this group (CW 11/27/04, 8/27/12)

Mismatched business / proof dies

• • 1999 $5 and $10 gold eagles struck with unfinished proof dies (W-mintmark)
  • 1998-2000 business strike cents with proof-style reverse (Wide AM)
  • 1998-S and 1999-S proof cents with business-style reverse (Close AM)
  • 1956 – 1964 quarters with “Type B” proof reverse
  • 1956 – 1963 halves with “Type 2” proof reverse
  • 1969-P, 1970-P and 1970-D Roosevelt dimes struck with 1968-S reverse proof dies
  • 1939 proof Jefferson nickel obverse with 1938 reverse
  • 1940 proof Jefferson nickel obverse with 1938 reverse

Finished proof die matched with business die

• • Early 19th century examples (CW 8/20/12)

Transitional Reverse (Minor temporal mismatches) e.g.:

• • 1939 nickel with reverse of 1938
  • 1940 nickel with reverse of 1938 or 1939
    
  • Proof 1940 nickel with reverse of 1938 (CW 4/19/08)
  • 1964-D quarter with the “Type C” reverse of 1965
  • 1988-D and P Lincoln cents with reverse of 1989
  • 1992-D and P cent with “Close AM” reverse
  • 2008-P Silver Eagle Bullion Coin with 2007-P Reverse
    • COIN WORLD SPECIAL: article posted HERE

Inverted die installation (not an error) (CW 2/15/10, 7/22/19, 1/6/20)

• • Older issues struck with inverted dies (e.g. buffalo nickels and Mercury dimes)
  • Re-introduction of inverted dies (beginning 1989) (CW 12/11/23)
  • Saddle strikes produced by inverted dies (CW 9/13/10, 9/19/16)

Late use of traditional die setup (CW 6/5/18)

Fixed rotated die errors (see Part VI)

Collar Installation Errors

• • Smooth edge instead of reeded edge (and vice versa)
    • 1863 Indian cent with reeded edge (CW 6/3/02)
  • Smooth edge instead of edge design (and vice versa)
  • Reeded edge instead of edge design (and vice versa)
  • Segmented proof collar with segments out-of-order (CW 4/7/08
    • 2007-S Proof Presidential dollar with segments arranged in wrong sequence (CW 4/7/08)

Use of flat, featureless dies (CW 6/30/14)

Use of cancelled and defaced dies (CW 5/12/14)

Cancellation overstrikes (coins overstruck by canceled coin, pattern or test dies) (CW 5/8/17, 5/24/21)

Design/composition mismatches (CW 2/10/20)

Green lettering – major heading

Blue lettering – linked to subject matter

Brown lettering – subject matter covered under that heading

Black lettering – no entry yet