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1964-D RPM?

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  • #1

    1964-D RPM?

    Good evening, I am starting to learn mint marks, they’re variations and errors. Some of my 1964D dimes have it looks like a double D. I would appreciate your expert opinions. thank you for taking a look.
    2024_0629_003925_321.jpeg
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  • #2
    I will assist tomorrow on this BUT Food for thought....

    Look at the D as a whole. Look how thin the horizontal area of the bottom of the D is , and then compare it to the top horizonal bar.

    Check the reverse of the coin to see if there is any other potential damage.

    Mint marks prior to 1990 were hammered into each working die. This means that each working die had its own unique placement of the mint mark. An overlay might be able to be made, to line up with known examples. Some people use their keen eyes to note the location of the example on line, then, they look at theirs to see if it is a match.

    Mintmarks are varieties, and the best place to look these up might be....

    Https://conecaonline.info
    Http://Varietyvista.com
    Https://doubleddie.com
    Gary Kozera
    Website: https://MintErrors.org

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    • #3
      I wasn’t aware of the overlay, makes sense or else mint marks would be all over the place. So you what you’re saying is that this is possibly the overlay I am seeing below the coin? I will try to find a way to see if I can use some type of measuring tool to note the location of another mint mark On a similar 1964 dime. Any advice or link to reference on how to measure would be appreciated. I truly appreciate you taking the time to view this coin. I learn more each post. If this is the overlay I am seeing that would eliminate several other questionable Mint marks I have.

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      • #4
        what you do is try to have two photos of the same basic shape and KB size. One is your photo. The other photo can be from an example on the attributors website. IF both photos are close in size and dimensions, plus they show some areas of the coin, you can use some file editing software on a PC, like Paint dot Net, and create an overlay, where one photo is put on top of another. Then the top photo can be almost translucent, where you can see through it. From there you can move it to where some of the background devices line up exactly.....then look where the mintmarks are. IF it is a match, it needs to be right on and an exact match for it to be the same RPM.

        SOME places copyright limit you from posting their photos on other websites - but they don't mind you using them for personal use. Some allow you to download the photos to your PC and do the overlay on just YOUR PC. It depends on the website and their claims. Check the website or, email them and tell them what you would like to do and get a written approval before proceeding, if required.

        Prior to 1990, the working dies back in the day didn't have mint marks on them. The mints would add the mint mark after the dies were impressed with the coin image. This means the placement of the mintmark was not always in the same exact location on every working die. That means you can have slight location differences and with an overlay of two photos either confirm or debunk the RPM number.

        I hope that makes the answer a little more clear.

        A few more things. IF you look at the examples the attribution web sites use, they are pretty square and straight on centered on the mint mark with the photos. Having the nearly exact photo keeps us from having to twist photos and take extra time to try to see if it is even a match.

        variety vista does offer a "mint mark style" area. This shows the common mint mark that was used on most coins made for that year. that way you can see what was used, and determine if the shape is correct or, if the coin in hand has had some worthless doubling on it, or could be an RPM.

        http://varietyvista.com/07%20Rooseve...k%20Styles.htm
        Last edited by MintErrors; 06-29-2024, 05:50 PM.
        Gary Kozera
        Website: https://MintErrors.org

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        • #5
          Yes, it does. Thank you very much for the detailed explanation and guidance. I have some work to do, but that’s what it’s all about!! I have one using VV mint variety section and it has been helpful. I enjoy research so it will be more fun than work. I’m pretty handy with a computer, I just need to find the right app for my Mac. thanks again I really appreciate it

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          • #6
            I'm sorry Conan62,
            I believe this mintmark is Localized Machine Doubled. I don't believe this is an RPM. Notice it's flat/ shelf like with the primary "D" mintmark?
            It's great your learning. Localized is very common on many denomintations. I personally made the same mistake at a coin show last weekend - terrible lighting sometimes makes this / and an actual variety hard to identify - all because of lighting.
            Keep looking they are out there,
            Eric

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            • #7
              Thank you!

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