DD versus Machine Doubling

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Whitby
Whitby Posts: 1,341
in U.S. Coin Forum
OK, can someone please provide an explanation of the difference between machine doubling and a true DD?

I have no clear idea and I look forward to the replies...

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  • ahooka454
    ahooka454 Posts: 3,466 ✭
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    a true dbl die is easy to see once you know what to look for. Machine dbling is striking error. no big deal. a dbl die is doubling on the die not the coin. just look at some photos and you will see what the difference is.... sorry i dont have any right now. someone here will
  • Paultjuno
    Paultjuno Posts: 76
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    Back to top .... just curious as I also would like a better explanation. I've never quite understood. How does doubling on the die occur in the first place, seems qa should spot these before it ever becomes an issue.
  • TAClough
    TAClough Posts: 1,598 ✭
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    Look at the profile of this coin, you will notice machine doubling of the profile and some of the letters (shelf like appearance).
    image



    Now look at the following pictures, you will notice a ridge between the letters.
    image

    image

    Hope this helps.
  • MrSpud
    MrSpud Posts: 4,499 ✭✭✭
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    A true double die is where the actual die that stamps the coins was accidently impressed with a doubled image, whereas machine doubling has a die with no doubling but the planchet moves as the coin is being stamped and some of the coin looks similar to a doubled die coin. The typical pickup point for a true doebled die is split serifs on the letters and no doubling of the mintmark on older coins. The typical description of machine doubling is a shelf like appearance to the doubling with no clear splits on the serifs of the letters.
  • Type2
    Type2 Posts: 13,985 ✭✭✭✭✭
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    DDO not machine.image Machine on bottom image


    Hoard the keys.
  • TexasNationals
    TexasNationals Posts: 3,837 ✭
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    On a doubled die, doubling (almost always, exception 1909 DDO) will be rounded and show extra thickness or serifs and rounded if there is a break in doubling. Mechanical doubling, or strike doubling (aka double die, note double not doubled) will be flat and shelf like doubling. Also the MM is usually affected ant this is a telltale sign of strike doubling before the 1990's when the MM was put into the master hub so it will show doubling also.

  • TexasNationals
    TexasNationals Posts: 3,837 ✭
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    Type 2 shows it great, rounded doubling on the DDO and flat shelf like doubling on the machine doubled coin.

    good job type 2image
  • dbldie55
    dbldie55 Posts: 7,753 ✭✭✭✭✭
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    JT Stanton wrote a great piece on it. You can access it here.
    Collector and Researcher of Liberty Head Nickels. ANA LM-6053
  • mgoodm3
    mgoodm3 Posts: 17,497 ✭✭✭
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    image
    coinimaging.com/my photography articles Check out the new macro lens testing section
  • jfoot13
    jfoot13 Posts: 2,677 ✭✭✭
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    cherry pickers guide has a nice section on all the classes of DD and the difference between them and machine doubling and pics... even a little quiz at the end to see how well you learned your lesson... a lot of information and will point you in the right direction..... great investment
    If you can't swim you better stay in the boat.......
  • ProofArtworkonCircs
    ProofArtworkonCircs Posts: 4,223 ✭
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    Note for Paultjuno
    There are cases where the mint knew they had a doubled die and tried to buff the evidence off and then used the die and even pulled ithem and buffed them a second time.
  • coinsarefun
    coinsarefun Posts: 21,781 ✭✭✭✭✭
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    This link was very helpful to me
    Hope it helps you out.

    Educational Series on Die Doubling
    CoinsAreFun Pictorials Album FOR SALE SOME will mark final ones before auction
    .
    CoinsAreFun Toned Silver Eagle Proof Album
    .
    Gallery Mint Museum, Ron Landis& Joe Rust, The beginnings of the Golden Dollar
    .
    More CoinsAreFun Pictorials NGC FOR SALE
  • Frankcoins
    Frankcoins Posts: 4,572 ✭✭✭
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    << <i>Note for Paultjuno
    There are cases where the mint knew they had a doubled die and tried to buff the evidence off and then used the die and even pulled ithem and buffed them a second time. >>



    What are some examples of this?
    Frank Provasek - PCGS Authorized Dealer, Life Member ANA, Member TNA. www.frankcoins.com
  • ProofArtworkonCircs
    ProofArtworkonCircs Posts: 4,223 ✭
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    Here is yet another source of information on doubled dies by Mr. Stanton again.
    http://www.coin-gallery.com/cgstanton3.htm

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