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24732Re: Three impressive examples of "slide doubling"

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  • Mike Diamond
    Nov 4, 2011
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      Sorry, I meant to say "initial design ablation error".

      --- In errorcoininformationexchange@yahoogroups.com, "Mike Diamond" <mdia1@...> wrote:
      >
      > Although the two nickels share faint clash marks of identical strength in exactly the same location, the pattern of die scratches is totally different between the two specimens. So I must conclude they're from different die pairs.
      >
      > In each case, what looks like damage along the obverse periphery opposite the misalignment is damage caused by the sliding die.
      >
      > Each shows an initial die ablation error. The die landed in a centered position and slid over to one side during the downstroke. This left characteristic fine parallel striations.
      >
      > --- In errorcoininformationexchange@yahoogroups.com, "Mike Diamond" <mdia1@> wrote:
      > >
      > > Slide doubling is a form of machine doubling that occurs when a die shifts sideways after reaching the lowest point of its downstroke. In doing so it smears the design.
      > >
      > > Severe examples are rare, but in recent weeks eBay has provided three exceptional specimens:
      > >
      > > http://www.ebay.com/itm/280762957624
      > >
      > > http://www.ebay.com/itm/280762988273
      > >
      > > http://www.ebay.com/itm/390356324189
      > >
      > > In each case the die obverse die landed in a misaligned position and then scraped its way back toward the center. In the case of the 1996-D quarter, the die actually touched down in a centered position, jogged to the right as it completed its downstroke, and lurched to the left creating the machine doubling. I have a second quarter struck by the same die pair that shows the same pattern, and I've seen a third. The "damage" along the right margin appears to represent damage to the coin generated during the strike by burrs or irregular damage present on the edge of the die. I suspect the "damage" on the two nickels was also generated during the strike, but I don't have them in hand yet to verify this suspicion.
      > >
      > > Since the quarter moved to the right during its downstroke (leaving a featureless crescent marked by fine parallel striations) it would necessarily have erased any lightly-impressed design elements it generated during initial touchdown. It would therefore represent a "design ablation" error. I suspect at least one of the nickels shows a similar design ablation error.
      > >
      > > Even though their misalignments are in opposite directions, I'm hoping the two 1999-D nickels were struck by the same die pair. I'll report back.
      > >
      >
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