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bumps on the suface of a 1983 ddr penny

joebb21joebb21 Posts: 4,760 ✭✭✭✭✭
in U.S. Coin Forum
This coin is graded ms67RD by pcgs (not that this is the question)

What causes all the bumps on the coin? I thought electrotype coins have looks like this.
image
may the fonz be with you...always...

Comments

  • commoncents05commoncents05 Posts: 10,096 ✭✭✭
    Very common on Zincolns. The copper plating does not adhere properly to the zinc core, and bubbles form.

    -Paul
    Many Quality coins for sale at http://www.CommonCentsRareCoins.com
  • tahoe98tahoe98 Posts: 11,388 ✭✭✭


    << <i>This coin is graded ms67RD by pcgs (not that this is the question)

    What causes all the bumps on the coin? I thought electrotype coins have looks like this.
    image >>



    ...probably the copper reacting with the zinc under neath.
    "government is not reason, it is not eloquence-it is a force! like fire, it is a dangerous servant and a fearful master; never for a moment should it be left to irresponsible action." George Washington
  • coindeucecoindeuce Posts: 13,496 ✭✭✭✭✭
    The Mint facilities did a poor job of scheduling the application of the copper plating to the 95% zinc core of the raw sheet stock. Even a brief period of exposure of the zinc core to an uncontrolled atmosphere created a barrier to nominal bonding to the copper plating.

    "Everything is on its way to somewhere. Everything." - George Malley, Phenomenon
    http://www.american-legacy-coins.com

  • crypto79crypto79 Posts: 8,623 ✭
    that's a shame for a tough coin. Beyond hope, not a 67 and one of the many reasons I do not collect copper coins ( i am aware there is less of a % of content copper in the modern penny then classic coin silver but the top part is pure).
  • ctf_error_coinsctf_error_coins Posts: 15,433 ✭✭✭✭✭
    I have several examples of 2010 shield cents with extreme planchet bubbles, I think they are kinda cool ....
  • lostincoinslostincoins Posts: 4,278 ✭
    Along with improper bonding, when a die gets hot that heat is transferred to the coin. With this transfer of heat a reaction is caused, that reaction can have an off gassing effect which could cause the bubbles to form as a pressure distortion.
    Hope this helps. (was this a proper enough response?)
  • rickoricko Posts: 98,724 ✭✭✭✭✭
    This is found on many of the modern cents..... I say many, by that I mean it is not uncommon, but by no means prevalent. Cheers, RickO
  • johnny9434johnny9434 Posts: 29,055 ✭✭✭✭✭
    what a shame to see that on a such a nice coin. it is common on the zincs image
  • guitarwesguitarwes Posts: 9,289 ✭✭✭
    Yep. where's the Reverse image?
    @ Elite CNC Routing & Woodworks on Facebook. Check out my work.
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  • BillJonesBillJones Posts: 34,667 ✭✭✭✭✭
    The only time I would be concerned is if the bubble is broken, and the zinc is showing. Zinc is very reactive to the air, and the coin could rot from within.
    Retired dealer and avid collector of U.S. type coins, 19th century presidential campaign medalets and selected medals. In recent years I have been working on a set of British coins - at least one coin from each king or queen who issued pieces that are collectible. I am also collecting at least one coin for each Roman emperor from Julius Caesar to ... ?
  • LanceNewmanOCCLanceNewmanOCC Posts: 19,999 ✭✭✭✭✭
    .
    WAC!!!
    .

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  • AMRCAMRC Posts: 4,280 ✭✭✭✭✭
    Hard to understand how that still graded.....
    MLAeBayNumismatics: "The greatest hobby in the world!"
  • ambro51ambro51 Posts: 13,931 ✭✭✭✭✭
    So was this present when it was graded????
  • MsMorrisineMsMorrisine Posts: 34,969 ✭✭✭✭✭


    << <i>Hard to understand how that still graded..... >>



    As struck

    Typical blistering but in a more than typical amount.

    There are some that are long like worms.

    Current maintainer of Stone's Master List of Favorite Websites // My BST transactions
  • MsMorrisineMsMorrisine Posts: 34,969 ✭✭✭✭✭


    << <i>So was this present when it was graded???? >>



    More than likely.

    The top 3 bane of new money
    Was
    Hits
    Blisters
    Spots

    Maybe in last 5-10 years
    Hits
    Spots
    Blisters

    The real killer lately is the spotting, so in the last few years, maybe 1&2 are tied.

    Current maintainer of Stone's Master List of Favorite Websites // My BST transactions
  • tahoe98tahoe98 Posts: 11,388 ✭✭✭


    << <i>Yep. where's the Reverse image? >>



    ...me curious as well......image
    "government is not reason, it is not eloquence-it is a force! like fire, it is a dangerous servant and a fearful master; never for a moment should it be left to irresponsible action." George Washington

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