The following copper half shows a 5 degree rotation between strikes on both sides. The piece was offered in Heritage 8/2010 sale.

This is the unique 1846 quarter eagle trial struck in copper. This famous trial is also a mint error - one of only 5 or 6 significant pattern mint errors known in the entire pattern series.

After being struck as a quarter eagle, the coin appears to have been placed on top of a half eagle planchet and was then struck by half eagle dies. This is known as a piggy-back rider error. The coin was aligned such that the half eagle obverse was struck over the reverse side of the quarter eagle die trial. Although the quarter eagle obverse was flattened by the half eagle planchet underneath, both dates are clearly visible.

This unique piece is ex 52 ANA lot 4478, 58 ANA lot 469, Bowers and Merena 5/93, Mike Byers as PCGS62BN, Heritage 1/07 as NGC65BN, Simpson-Heritage 9/20 - PCGS65BN.

The following 3 cent pattern shows about a 10-15% rotation between strikings on the reverse.

This example is the former Harry W. Bass Jr. Research Foundation example. It is likely lot 890 from H. Chapman's 7/25/22 sale where it was described as "The reverse twice struck so that the III lies across the other". The coin was purchased by Virgil Brand and entered into his journal as #122061.

This uniface pattern trime shows just the reverse. It appears that 2 planchets were fed into the press at the same time as opposed to some kind of brockage or die cap error.

Does anyone have the piece showing just the obverse?

It is believed to be unique and is ex H Chapman 6/1908 Taylor Windle sale lot 1308, Brand (journal #44209), Kelly 2/13/41 B.G. Johnson invoice, Bolt, Numismatics Ltd, Bowers and Merena 6/96, Fred Weinberg, Heritage 9/97, Heritage 11/03, Mike Byers, Heritage 5/07.

The following is a 60% off-center example of J151/P17.

Its earliest recorded appearance was in Bluestone's 6/1940 sale where it was described as follows:



This piece reappeared in ANR's March 2005 sale and later in Heritage's January 2006 FUN and 2006 ANA sales.

This is probably one of the most spectacular pattern mint errors known today.

The following broadstruck one cent pattern was offered in Superior's 5/2003 and ANR's 7/05 and 11/06 sales. It also appears to have been struck from misaligned dies as the reverse appears off-center.

The following flying eagle large cent pattern shows a double struck obverse.

The enlargement below shows the doubling especially on Liberty's neck and the left side denticles.

The following flying eagle cent pattern, for Heritage's 2010 FUN sale shows double striking on the reverse with about a 10-15% rotation.

According to Rick Kay, several others show very slight doubling on the reverse and there is at least one with doubling on the obverse.

The following 1855 cent shows about a 5% rotation between strikings. It is ex Hewitt 4/17/1972, Bass-B/M 5/99, Heritage 4/21 internet error auction - PCGS64BN.

The following Paquet half dollar has a slightly double struck obverse. This is most noticeable on Liberty's head as shown in the image below.

It is ex River Oaks-B/R 11/76, B/R 6/77, B/R 4/78, Superior 1/96 as ANACSAU50, Heritage 7/03, Heritage 4/08, Byers

This pattern is believed to have been struck outside the mint from dies sold as scrap that were purchased by Joseph J. Mickley.

2 of the 4 known examples show rotational doublestriking on the reverse.

The illustrated example at the top, ex Crouch-Superior 6/77, Stacks 11/08, shows a 170 degree rotation on the reverse between strikes.

The illustrated example below, ex Bowers and Merena 6/96, Heritage 11/03, ANR/Stacks 11/06 as NGC63BN, Simpson collection shows a 40 degree rotation on the reverse between strikes. This is currently in an PCGS64BN holder.

This pattern shows a 5 degree rotation on the reverse die between strikes. This is most noticeable in the image by the "shadow" around the "O" in "One" as illustrated here.



It is ex 73 FUN, Harry W. Bass Jr. Research Foundation, B/M 5/99, Cassel-Heritage 8/15 ANA, StacksBowers 5/19 - NGC67BN.

This is probably the most fantastic pattern mint error known. It is a flipover double strike ex Stacks 8/41 Opezzo sale, Bolt, Numismatics Ltd, Bowers and Merena's 6/96, Sturgeon-Bowers and Merena 1/2002 where it is graded ANACS63BN.

The following off-metal indian cent is doublestruck with the second strike 95% off-center. It has been analyzed and found to be 81% copper, 18% nickel, and 1% iron. The finding of this piece, makes it likely that all examples of J669/P745 are actually mint errors struck on leftover copper-nickel stock. The coin is in graded PCGSMS60 but, regrettably, the weight is not given.

Apparently, the piece is ex Kosoff-58 ANA lot 398, Numismatics LTD Spring 1983 FPL, it has more recently been offered in Heritage January 2010 FUN, and Bowers & Merena's 3/2010 sales as PCGS60. There is a strong possibility that this coin was earlier in the Col Green collection as one described as "Unc, but misstruck. The only pattern misstruck we have ever seen" appears in the Newman-Johnson inventory of their Col Green purchases as well as in a June 24, 1943 invoice to F.C.C. Boyd. Another from Morgenthau's 5/35 sale is listed as struck without collar, ie a broadstruck mint error.

This aluminum die trial shows a very pronounced rotation between strikes on the obverse. The earliest offering for this was in Bowers & Ruddy's 9/75 Winthrop sale and was later offered in Stacks-Bowers 1/13, 3/13 and 6/13 sales as PCGS64.

The following aluminum half dime die trial, ex Col Green, Eric Newman-EPNNES, Heritage 4/13, shows a 10% rotation between strikings. This is especially obvious under "TES" of "STATES" on the obverse where the first impression of Liberty's head shows and on the reverse around the value "Half Dime".

This example of the 1869 Standard Silver dime shows a 5 degree rotation between strikes on the obverse. See the illustration below for a closer look. It is ex Goldberg's August 2014, LegendAuctions 2/23 - NGC64BN.

This example of the 1869 Standard Silver Quarter shows a 30 degree rotation between strikes. This is most noticeable on the obverse behind Liberty's head, between the "D and S" of "United States" and at the top of the "2" in "25" on the reverse as shown in the image here.



It was originally part of the famous Lenox Lohr collection and was later offered in Bowers and Merena's 6/91 Polis sale, a 2006 Heritage sale, Heritage 2007 FUN sale and Stacks 8/07.

This is an example of one of the Standard Silver dime patterns struck on misrolled nickel three cent planchet stock or 1969 pattern one cent stock for J666/P741. Notice that the planchet diameter was too small to fill out the entire die face. This is most noticeable at 6:00 on the obverse.

It is unique and is ex B/M 6/96 where described as struck on a three cent silver planchet, Simpson collection, Legend 1/17, Mike Byers and was grade PCGS65. The holder notes the coin as being 76% copper, 24% nickel.

The following dime pattern was recently submitted to NGC. It is an example of J839/P930 struck over J845/P944. It is likely the only known pattern struck over another pattern.

The images here show the positioning of the 2 obverses relative to each other.

The following is an example of the standard silver half dollar pattern J957/P1108 having a slight rotational double striking error on the obverse. This is most noticeable in the letters on the left side as shown in the image here.

This example of Longacre's seated liberty design shows a 5 degree rotation on the reverse as shown in the image below.



Recent offerings include Heritage 2011 FUN and StacksBowers 3/15 sales.

The following 1871 Longacre pattern, the former Harry Bass example, shows a 5 degree rotation on the reverse. This is most notable at the A and M of United States of America as shown below.

The following example of Longacre's seated liberty design has very slight doubling on the obverse most noticeable in the denticles under the date. It was last offered in Heritage's June 2006 sale.

The following double eagle copper die trial, from Bowers and Merena March 2006 sale, shows a rotation of about 5 degrees between strikings on the obverse.

This is most noticeable on the right side as shown in the image here.

This is an example of the Bickford eagle broadstruck in nickel. It is ex Woodin-1914 ANS exhibit, Newcomer, Col Green, Kreisberg-Schulman 2/60, Empire Review #15 (3/1962) & #17 (12/1962), Schorer 5/73, Bass, HWBRF-Heritage 1/23 FUN - PCGS67.

As it was broadstruck, we do not really know if this piece was meant to be a J1377/P1522 or a J1378/P1523.

This example of one of Morgan's 1877 half dollars shows a 5 degree rotation between strikes on the obverse. It is most noticeable where a shadow "E" appears under star 6 and a shadow "U" surrounds the second period between the "S" in "Pluribus" and the first "U" in "Unum".



This piece is ex Judd, Krouner, Coronet Coin Fixed Price List, Champa-B/R 5/72, Harry W. Bass Jr. Research Foundation-B/M 5/99, M. Hagen, Simpson-Heritage 8/21 - PCGS66RB.

An example of the 1965 Martha Washington half dollar, J2132/P2083 has been discovered struck on a copper-nickel clad quarter planchet.

The only other examples of this rare pattern are the two on a full cupro-nickel clad half dollar planchet and 6 pieces struck in silver-clad J2134/P2083 embedded in 2 blocks of lucite which reside in the Smithsonian.

These dies serve as the Mint's all-purpose dies and are given out to outside companies by the mint for testing. It is, therefore, not known whether or not this mint error was made inside or outside the Mint.

The illustrated piece, struck from heavily clashed dies, sold in Heritage 3/2003 sale for $29,900 and resold for $21,850 in Heritage 2004 ANA sale.

The illustrated piece is one of 2 which appeared in Heritage's January 2010 FUN sale. These Martha Washington pieces were struck on dime planchets from cent dies - notice that the full detail is missing on the left side due to the smaller planchet. The illustrated piece is the nicer of the 2. The other was cleaned and was in an NCS holder.