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Re: 1968 kennedy half dollar copper core

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  • llydston
    I don;t know if this has been answered or not Fred but the Photo s are on page two of the default album. Select Last near the bottom of the page.
    Message 1 of 35 , Aug 3, 2010
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      I don;t know if this has been answered or not Fred but the Photo's are on page two of the default album. Select "Last" near the bottom of the page.

      --- In errorcoininformationexchange@yahoogroups.com, fred_weinberg <no_reply@...> wrote:
      >
      > Mike, 11.6 grams vrs. 11.5 grams isn't a significant
      > difference in weight for half dollars, imo.
      >
      > It's within tolerance (11.9 high).
      >
      > Although none of us can be certain without
      > one or more of the tests mentioned, I'd be
      > willing to bet that the coin is a normal 40%
      > half, and that the copper core has 'toned'
      > 'oxidized', or something similar, so that the
      > copper edge is darker than normal.
      >
      > Just my thoughts from reading the posts. Also, I went
      > back to the photo album to view the scans again, and they
      > have been removed.......
      >
      > Fred
      >
      > --- In errorcoininformationexchange@yahoogroups.com, "Mike Diamond" <mdia1@> wrote:
      > >
      > > Grains is not "more accurate". It is simply a different unit of measure. Since "jarrett" weighed the coin to the nearest hundredth of a gram, that's sufficiently precise for most purposes. As to the accuracy of his scale, that should be tested with a standard if there's any question about the mechanism's reliability.
      > >
      > > --- In errorcoininformationexchange@yahoogroups.com, taxi_steve929@ wrote:
      > > >
      > > > Hi, I suggested grains because its more accurate. I can send info when at computer tomorrow or you can google it for overview and different methods. In a nutshell SG=Dry Weight/(Dry weight - Wet weight). Wet weight should be done in distilled water and the scale should be tared with whatever apparatus you use to hold the coin already in the water. There are photos of various set ups already on the net, but I can post pics of my set-up with detailed instructions. Its as good as any other I've seen.
      > > > Sent via BlackBerry by AT&T
      > > >
      > > > -----Original Message-----
      > > > From: "jarett" <jmduke1@>
      > > > Sender: errorcoininformationexchange@yahoogroups.com
      > > > Date: Mon, 02 Aug 2010 19:03:01
      > > > To: <errorcoininformationexchange@yahoogroups.com>
      > > > Reply-To: errorcoininformationexchange@yahoogroups.com
      > > > Subject: [Error Coin Information Exchange] Re: 1968 kennedy half dollar copper core
      > > >
      > > > when looking closely at the coin a normal clad coin is copper core from one side to the other. this does not seem to look like that!!! it is only copper on one half of the coin. the other half looks like a regular 40% coin. and yes 11.60 grams to the 100th. i can look up a sg test or someone can save me the time and explain the concept please!
      > > >
      > > > --- In errorcoininformationexchange@yahoogroups.com, "jarett" <jmduke1@> wrote:
      > > > >
      > > > > well i posted the pics in the default album even a pick of the copper side and the date showing. if anyone can point me in the direction to get this new error specimen confirmed of its authenticity I would greatly appreciate it. thank you .
      > > > >
      > > >
      > >
      >
    • jarett
      the only mention of 180% is from you!!!!! it is 360% allthe way around the coin. it is copper only on half of the thickness of the edge!
      Message 35 of 35 , Aug 3, 2010
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        the only mention of 180% is from you!!!!! it is 360% allthe way around the coin. it is copper only on half of the thickness of the edge!

        --- In errorcoininformationexchange@yahoogroups.com, "Mike Diamond" <mdia1@...> wrote:
        >
        > I would also think this 11.60 g value is within the normal range of variation for silver-clad half dollars. Also, since jarrett describes 180 arc degrees of the exposed core as showing a normal color (presumably gray), this greatly reduces the chances that this coin is anything other than a normal half dollar of the period. Pity.
        >
        > --- In errorcoininformationexchange@yahoogroups.com, fred_weinberg <no_reply@> wrote:
        > >
        > > Mike, 11.6 grams vrs. 11.5 grams isn't a significant
        > > difference in weight for half dollars, imo.
        > >
        > > It's within tolerance (11.9 high).
        > >
        > > Although none of us can be certain without
        > > one or more of the tests mentioned, I'd be
        > > willing to bet that the coin is a normal 40%
        > > half, and that the copper core has 'toned'
        > > 'oxidized', or something similar, so that the
        > > copper edge is darker than normal.
        > >
        > > Just my thoughts from reading the posts. Also, I went
        > > back to the photo album to view the scans again, and they
        > > have been removed.......
        > >
        > > Fred
        > >
        > > --- In errorcoininformationexchange@yahoogroups.com, "Mike Diamond" <mdia1@> wrote:
        > > >
        > > > Grains is not "more accurate". It is simply a different unit of measure. Since "jarrett" weighed the coin to the nearest hundredth of a gram, that's sufficiently precise for most purposes. As to the accuracy of his scale, that should be tested with a standard if there's any question about the mechanism's reliability.
        > > >
        > > > --- In errorcoininformationexchange@yahoogroups.com, taxi_steve929@ wrote:
        > > > >
        > > > > Hi, I suggested grains because its more accurate. I can send info when at computer tomorrow or you can google it for overview and different methods. In a nutshell SG=Dry Weight/(Dry weight - Wet weight). Wet weight should be done in distilled water and the scale should be tared with whatever apparatus you use to hold the coin already in the water. There are photos of various set ups already on the net, but I can post pics of my set-up with detailed instructions. Its as good as any other I've seen.
        > > > > Sent via BlackBerry by AT&T
        > > > >
        > > > > -----Original Message-----
        > > > > From: "jarett" <jmduke1@>
        > > > > Sender: errorcoininformationexchange@yahoogroups.com
        > > > > Date: Mon, 02 Aug 2010 19:03:01
        > > > > To: <errorcoininformationexchange@yahoogroups.com>
        > > > > Reply-To: errorcoininformationexchange@yahoogroups.com
        > > > > Subject: [Error Coin Information Exchange] Re: 1968 kennedy half dollar copper core
        > > > >
        > > > > when looking closely at the coin a normal clad coin is copper core from one side to the other. this does not seem to look like that!!! it is only copper on one half of the coin. the other half looks like a regular 40% coin. and yes 11.60 grams to the 100th. i can look up a sg test or someone can save me the time and explain the concept please!
        > > > >
        > > > > --- In errorcoininformationexchange@yahoogroups.com, "jarett" <jmduke1@> wrote:
        > > > > >
        > > > > > well i posted the pics in the default album even a pick of the copper side and the date showing. if anyone can point me in the direction to get this new error specimen confirmed of its authenticity I would greatly appreciate it. thank you .
        > > > > >
        > > > >
        > > >
        > >
        >
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