Recent Content by robc

  1. robc
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    1964 copper nickel ?????

    I believe they are of value. The history of those test pieces I described earlier in this thread. I was the research engineer that developed the...
    Post by: robc, Apr 9, 2012 in forum: US Coins Forum
  2. robc
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    1964 copper nickel ?????

    I understand. Thanks for clarification.
    Post by: robc, Mar 10, 2011 in forum: US Coins Forum
  3. robc
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    1964 copper nickel ?????

    Are you suggesting I make a photo of the test pieces from 45 years ago? With regard to the inserted message regarding a piece that was...
    Post by: robc, Mar 9, 2011 in forum: US Coins Forum
  4. robc
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    1964 copper nickel ?????

    No it was not the JFK coin it was a coin made to the same coinage engraving specs with a bust of Paul D Merica on face and a depiction of the INCO...
    Post by: robc, Mar 9, 2011 in forum: US Coins Forum
  5. robc
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    1964 copper nickel ?????

    The test piece work was none with dies made from a master engraving done by Gilroy Roberts; then the chief engraver of the US Mint. INCO paid him...
    Post by: robc, Mar 8, 2011 in forum: US Coins Forum
  6. robc
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    Density of silver alloys

    Ag is 10.5 g/cc and Cu is 8.89. (.925 * 10.5) + (.075* 8.89) = 10.379 g/cc
    Post by: robc, Mar 8, 2011 in forum: Coin Chat
  7. robc
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    1964 copper nickel ?????

    I was the primary research metallurgist for the coinage materials INCO developed in 1963-65. The primary development work was done in INCO's...
    Post by: robc, Mar 8, 2011 in forum: US Coins Forum